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QUESTION
Why aren't my Qt5 language translations loading?
Asked 2022-Apr-01 at 16:09I am trying to write a simple qml application with language translations using CMake and although the application runs, it never shows translations. I'm on a Linux platform with CMake version 3.22.2 and Qt version 3.15.2 Here is the directory structure:
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12
CMakeLists.txt
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15
src/CMakeLists.txt
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38
src/main.cpp
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50
src/silly.qrc
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55
src/qml/silly.qml
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68
src/qml/translations/qml_de.ts
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80
src/qml/translations/qml_en.ts
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92
src/qml/translations/qml_fr.ts
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92<?xml version="1.0" encoding="utf-8"?>
93<!DOCTYPE TS>
94<TS version="2.1" language="fr_FR">
95<context>
96 <name>silly</name>
97 <message>
98 <location filename="../silly.qml" line="11"/>
99 <source>Hello</source>
100 <translation>Bonjour</translation>
101 </message>
102</context>
103</TS>
104It builds and runs with no errors, but when I attempt to test with this:
LANGUAGE=fr src/silly I get a button that says "Hello" instead of a button that says "Bonjour". I've been trying to figure this out for hours which also leads me to the secondary question: how does one generally troubleshoot Qt language translations? This is my first time and I could find no documentation on that.
ANSWER
Answered 2022-Apr-01 at 16:09That's pretty badly documented stuff which works magically with ready-made example using dedicated qmake configuration parameter embed_translations. I advice you to take a look into the original example's build dir where .qm files and a special qrc file qmake_qmake_qm_files.qrc get generated.
You don't need to use QTranslator unless you want to support dynamic language switch. At startup, QML runtime automatically loads a translation file qml_<language_COUNTRY>.qm (qml_xx_XX.qm where xx is ISO639 and XX is optional ISO 3166 code) from the i18n subdirectory of the root QML file, based on the system language, if it finds one.
You need to get your .qm files to qrc:/qml/i18n/ folder because your main qml file is in qrc:/qml/.
With CMake you can do it as follows:
Add a new qrc file, e.g. cmake_qm_files.qrc to your project
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92<?xml version="1.0" encoding="utf-8"?>
93<!DOCTYPE TS>
94<TS version="2.1" language="fr_FR">
95<context>
96 <name>silly</name>
97 <message>
98 <location filename="../silly.qml" line="11"/>
99 <source>Hello</source>
100 <translation>Bonjour</translation>
101 </message>
102</context>
103</TS>
104<RCC>
105 <qresource prefix="/qml/i18n">
106 <file>qml_de.qm</file>
107 <file>qml_en.qm</file>
108 <file>qml_fr.qm</file>
109 </qresource>
110</RCC>
111Get CMake to copy the qrc file to binary dir where .qm files get created
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92<?xml version="1.0" encoding="utf-8"?>
93<!DOCTYPE TS>
94<TS version="2.1" language="fr_FR">
95<context>
96 <name>silly</name>
97 <message>
98 <location filename="../silly.qml" line="11"/>
99 <source>Hello</source>
100 <translation>Bonjour</translation>
101 </message>
102</context>
103</TS>
104<RCC>
105 <qresource prefix="/qml/i18n">
106 <file>qml_de.qm</file>
107 <file>qml_en.qm</file>
108 <file>qml_fr.qm</file>
109 </qresource>
110</RCC>
111configure_file(cmake_qm_files.qrc ${CMAKE_BINARY_DIR} COPYONLY)
112Get qrc file resource compiled and embedded to your executable
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92<?xml version="1.0" encoding="utf-8"?>
93<!DOCTYPE TS>
94<TS version="2.1" language="fr_FR">
95<context>
96 <name>silly</name>
97 <message>
98 <location filename="../silly.qml" line="11"/>
99 <source>Hello</source>
100 <translation>Bonjour</translation>
101 </message>
102</context>
103</TS>
104<RCC>
105 <qresource prefix="/qml/i18n">
106 <file>qml_de.qm</file>
107 <file>qml_en.qm</file>
108 <file>qml_fr.qm</file>
109 </qresource>
110</RCC>
111configure_file(cmake_qm_files.qrc ${CMAKE_BINARY_DIR} COPYONLY)
112add_executable(silly main.cpp
113 ${QRC_RESOURCES}
114 ${CMAKE_BINARY_DIR}/cmake_qm_files.qrc
115)
116I typically use QLocale for translation testing as follows:
1├── CMakeLists.txt
2└── src
3 ├── CMakeLists.txt
4 ├── main.cpp
5 ├── silly.qrc
6 └── qml
7 ├── silly.qml
8 └── translations
9 ├── qml_de.ts
10 ├── qml_en.ts
11 └── qml_fr.ts
12cmake_minimum_required(VERSION 3.22)
13project(silly VERSION 1.0.0)
14add_subdirectory(src)
15cmake_minimum_required(VERSION 3.22)
16find_package(Qt5 COMPONENTS Qml Quick LinguistTools REQUIRED)
17set(TRANSLATIONS
18 qml/translations/qml_en.ts
19 qml/translations/qml_fr.ts
20 qml/translations/qml_de.ts
21)
22qt5_create_translation(QM_FILES ${CMAKE_CURRENT_SOURCE_DIR} ${TRANSLATIONS})
23qt5_add_resources(QRC_RESOURCES "silly.qrc")
24
25add_executable(silly main.cpp
26 "${QRC_RESOURCES}"
27 "${QM_FILES}"
28)
29target_compile_features(silly PUBLIC cxx_std_17)
30set_target_properties(silly PROPERTIES AUTOMOC ON AUTORCC ON)
31target_link_libraries(silly PRIVATE Qt5::Quick Qt5::Qml)
32target_include_directories(silly
33 PUBLIC
34 $<INSTALL_INTERFACE:.>
35 $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
36)
37install(TARGETS silly)
38#include <QGuiApplication>
39#include <QQmlApplicationEngine>
40
41int main(int argc, char *argv[])
42{
43 QGuiApplication app(argc, argv);
44 QQmlApplicationEngine engine;
45 engine.addImportPath("qrc:/");
46 engine.load(QUrl("qrc:/qml/silly.qml"));
47
48 return app.exec();
49}
50<!DOCTYPE RCC><RCC version="1.0">
51 <qresource prefix="/qml">
52 <file alias="silly.qml">qml/silly.qml</file>
53 </qresource>
54</RCC>
55import QtQuick 2.15
56import QtQuick.Window 2.15
57import QtQuick.Controls 2.15
58
59ApplicationWindow {
60 visible: true
61
62 Button {
63 anchors.fill: parent
64 spacing: 20
65 text: qsTr("Hello")
66 }
67}
68<?xml version="1.0" encoding="utf-8"?>
69<!DOCTYPE TS>
70<TS version="2.1" language="de_DE">
71<context>
72 <name>silly</name>
73 <message>
74 <location filename="../silly.qml" line="11"/>
75 <source>Hello</source>
76 <translation>Hallo</translation>
77 </message>
78</context>
79</TS>
80<?xml version="1.0" encoding="utf-8"?>
81<!DOCTYPE TS>
82<TS version="2.1" language="en_US">
83<context>
84 <name>silly</name>
85 <message>
86 <location filename="../silly.qml" line="11"/>
87 <source>Hello</source>
88 <translation type="unfinished"></translation>
89 </message>
90</context>
91</TS>
92<?xml version="1.0" encoding="utf-8"?>
93<!DOCTYPE TS>
94<TS version="2.1" language="fr_FR">
95<context>
96 <name>silly</name>
97 <message>
98 <location filename="../silly.qml" line="11"/>
99 <source>Hello</source>
100 <translation>Bonjour</translation>
101 </message>
102</context>
103</TS>
104<RCC>
105 <qresource prefix="/qml/i18n">
106 <file>qml_de.qm</file>
107 <file>qml_en.qm</file>
108 <file>qml_fr.qm</file>
109 </qresource>
110</RCC>
111configure_file(cmake_qm_files.qrc ${CMAKE_BINARY_DIR} COPYONLY)
112add_executable(silly main.cpp
113 ${QRC_RESOURCES}
114 ${CMAKE_BINARY_DIR}/cmake_qm_files.qrc
115)
116QGuiApplication app(argc, argv);
117
118QLocale systemLocale = QLocale::system();
119QLocale::Language language = systemLocale.language();
120QLocale::Country country = systemLocale.country();
121qDebug() << "System locale language:" << language << ", country:" << country;
122
123// TEST: change default locale by removing comments below
124// language = QLocale::French;
125// country = QLocale::France;
126language = QLocale::English;
127country = QLocale::Australia;
128QLocale locale(language, country);
129qDebug() << "Changing default locale to language:" << locale.language() << ", country:" << locale.country();
130QLocale::setDefault(locale); // TEST: set default locale to something else than system locale
131
132QQmlApplicationEngine engine;
133QUESTION
Combining Qt with OpenGL: does not compile
Asked 2022-Mar-19 at 21:50I'm trying to create a project in Qt with an QOpenGLWidget and CMake as a building tool. The problem is that it does not compile and I don't know why.
1[...]\include\ui_MainWindow.h:79: błąd: undefined reference to `__imp__ZN13QOpenGLWidgetC1EP7QWidget6QFlagsIN2Qt10WindowTypeEE'
2That's my CMakeLists.txt file:
1[...]\include\ui_MainWindow.h:79: błąd: undefined reference to `__imp__ZN13QOpenGLWidgetC1EP7QWidget6QFlagsIN2Qt10WindowTypeEE'
2cmake_minimum_required(VERSION 3.5)
3
4project(QtTest VERSION 0.1 LANGUAGES CXX)
5
6set(CMAKE_INCLUDE_CURRENT_DIR ON)
7
8set(CMAKE_AUTOUIC ON)
9set(CMAKE_AUTOMOC ON)
10set(CMAKE_AUTORCC ON)
11
12set(CMAKE_CXX_STANDARD 11)
13set(CMAKE_CXX_STANDARD_REQUIRED ON)
14
15find_package(OpenGL REQUIRED)
16find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
17find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)
18find_package(Qt${QT_VERSION_MAJOR} COMPONENTS OpenGL REQUIRED)
19
20set(PROJECT_SOURCES
21 src/main.cpp
22 src/MainWindow.cpp
23 src/MainWindow.hpp
24 src/MainWindow.ui
25)
26
27if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
28 qt_add_executable(QtTest
29 MANUAL_FINALIZATION
30 ${PROJECT_SOURCES}
31 )
32else()
33 add_executable(QtTest
34 ${PROJECT_SOURCES}
35 )
36endif()
37
38target_link_libraries(QtTest PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::OpenGL)
39
40set_target_properties(QtTest PROPERTIES
41 MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
42 MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
43 MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
44 MACOSX_BUNDLE TRUE
45 WIN32_EXECUTABLE TRUE
46)
47
48if(QT_VERSION_MAJOR EQUAL 6)
49 qt_finalize_executable(QtTest)
50endif()
51In my MainWindow.ui file I only create an QOpenGLWidget widget.
ANSWER
Answered 2022-Mar-19 at 21:50In Qt6 QOpenGLWidget was moved to a new module named OpenGLWidgets.
To make your program work you need to add OpenGLWidgets to your find_package command and Qt6::OpenGLWidgets to your target_link_libraries command.
1[...]\include\ui_MainWindow.h:79: błąd: undefined reference to `__imp__ZN13QOpenGLWidgetC1EP7QWidget6QFlagsIN2Qt10WindowTypeEE'
2cmake_minimum_required(VERSION 3.5)
3
4project(QtTest VERSION 0.1 LANGUAGES CXX)
5
6set(CMAKE_INCLUDE_CURRENT_DIR ON)
7
8set(CMAKE_AUTOUIC ON)
9set(CMAKE_AUTOMOC ON)
10set(CMAKE_AUTORCC ON)
11
12set(CMAKE_CXX_STANDARD 11)
13set(CMAKE_CXX_STANDARD_REQUIRED ON)
14
15find_package(OpenGL REQUIRED)
16find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
17find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)
18find_package(Qt${QT_VERSION_MAJOR} COMPONENTS OpenGL REQUIRED)
19
20set(PROJECT_SOURCES
21 src/main.cpp
22 src/MainWindow.cpp
23 src/MainWindow.hpp
24 src/MainWindow.ui
25)
26
27if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
28 qt_add_executable(QtTest
29 MANUAL_FINALIZATION
30 ${PROJECT_SOURCES}
31 )
32else()
33 add_executable(QtTest
34 ${PROJECT_SOURCES}
35 )
36endif()
37
38target_link_libraries(QtTest PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::OpenGL)
39
40set_target_properties(QtTest PROPERTIES
41 MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
42 MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
43 MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
44 MACOSX_BUNDLE TRUE
45 WIN32_EXECUTABLE TRUE
46)
47
48if(QT_VERSION_MAJOR EQUAL 6)
49 qt_finalize_executable(QtTest)
50endif()
51find_package(Qt6 COMPONENTS Widgets OpenGL OpenGLWidgets REQUIRED)
52target_link_libraries(QtTest PRIVATE Qt6::Widgets Qt6::OpenGL Qt6::OpenGLWidgets)
53QUESTION
Qt 5 Disabling Click-and-Hold
Asked 2022-Mar-17 at 08:29I'm trying to solve an issue in a Qt5 application that's caused by a touchscreen driver I wrote a couple years ago. The problem being that my touchscreen driver generates mouse press events to simulate touch behavior. This was because at the time I wrote it, my team was using an outdated Linux OS that didn't have a native touch driver.
The problem is that when I touch the +/- buttons (the scroll buttons that increase/decrease the slider by a single tick, or cause it to rapidly scroll if held), the slider rapidly slides up/down as if I had clicked and held the button. This is because my driver uses QApplication::postEvent() to dispatch the mouse event from a separate thread, and the delay in between touch and release is just long enough for it to register a click-and-hold type event, though the release event doesn't stop the sliding.
I would rewrite the application to use the now available native touch driver, but it doesn't offer enough control to be able to do what my driver does (my driver can generate left, right, or middle mouse events, whereas the native driver only provides left).
I tried rewriting the driver to use QApplication::sendEvent() instead, but that was causing a segmentation fault that I couldn't figure out the cause of.
So is there a way I can disable the "click-and-hold" type behavior on the QSlider itself? So that I can still tap the buttons, but they'll only increase/decrease by a single tick at a time?
EDIT: Here's an example of how I'm generating the "touch" events via my driver.
1void InputHandler::touchPress(TouchPoint * tp, QWidget * widget) {
2 QPoint screenPos(tp->cx(), tp->cy());
3 QWidget * target = widget;
4 if(target == NULL) target = QApplication::widgetAt(screenPos);
5
6 if(target != NULL) {
7 QPoint local = target->mapFromGlobal(screenPos);
8 QMouseEvent * press = new QMouseEvent(QEvent::MouseButtonPress, local, screenPos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
9 QApplication::postEvent(target, press);
10
11 DBG(" -- touch press on: " << typeid(*widget).name());
12
13 // Check to see if the target is a QLineEdit or QComboBox, and if so, set focus on it.
14 QLineEdit * lineEdit = dynamic_cast<QLineEdit*>(target);
15 QComboBox * comboBox = dynamic_cast<QComboBox*>(target);
16 if(lineEdit) lineEdit->setFocus(Qt::MouseFocusReason);
17 if(comboBox) comboBox->setFocus(Qt::MouseFocusReason);
18 }
19}
20EDIT 2: So a coworker played around with the slider and pointed out that he pressed the +/- buttons, causing it to slide, and then he clicks the "reset" button we have to reset all controls on the form, the slider would reset and then continue sliding, indicating that the touch press was never released. He then would click the +/- buttons normally with the mouse and reset again and it would stop. So even though the logs indicate that the mousePressEvent and mouseReleaseEvent methods are being triggered by my events, they don't seem to have the same behavior as using the mouse.
Any ideas?
EDIT 3: If it helps, I added an eventFilter and printed out every event type that the QSlider receives, from when I first touch the screen to when I release. The events received are:
1void InputHandler::touchPress(TouchPoint * tp, QWidget * widget) {
2 QPoint screenPos(tp->cx(), tp->cy());
3 QWidget * target = widget;
4 if(target == NULL) target = QApplication::widgetAt(screenPos);
5
6 if(target != NULL) {
7 QPoint local = target->mapFromGlobal(screenPos);
8 QMouseEvent * press = new QMouseEvent(QEvent::MouseButtonPress, local, screenPos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
9 QApplication::postEvent(target, press);
10
11 DBG(" -- touch press on: " << typeid(*widget).name());
12
13 // Check to see if the target is a QLineEdit or QComboBox, and if so, set focus on it.
14 QLineEdit * lineEdit = dynamic_cast<QLineEdit*>(target);
15 QComboBox * comboBox = dynamic_cast<QComboBox*>(target);
16 if(lineEdit) lineEdit->setFocus(Qt::MouseFocusReason);
17 if(comboBox) comboBox->setFocus(Qt::MouseFocusReason);
18 }
19}
20Mouse Press (2)
21Tooltip Change (184)
22Paint (12)
23Mouse Move (5)
24Mouse Move (5)
25Mouse Release (3)
26But then after the release event, I get spammed in the logs with QEvent::Timer events, which does not happen when I simply click with the mouse, as opposed to touching the slider with the touchscreen. If I then tap somewhere else, drag the slider, or click the slider with the actual mouse, these timer events stop.
Why is my generated QMouseEvent causing these QEvent::Timer events to be generated when I tap the slider with the touchscreen, but not with the mouse?
ANSWER
Answered 2022-Mar-17 at 08:29A minimal example to generate mouse press/release events that are correctly handled by QSlider is:
1void InputHandler::touchPress(TouchPoint * tp, QWidget * widget) {
2 QPoint screenPos(tp->cx(), tp->cy());
3 QWidget * target = widget;
4 if(target == NULL) target = QApplication::widgetAt(screenPos);
5
6 if(target != NULL) {
7 QPoint local = target->mapFromGlobal(screenPos);
8 QMouseEvent * press = new QMouseEvent(QEvent::MouseButtonPress, local, screenPos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
9 QApplication::postEvent(target, press);
10
11 DBG(" -- touch press on: " << typeid(*widget).name());
12
13 // Check to see if the target is a QLineEdit or QComboBox, and if so, set focus on it.
14 QLineEdit * lineEdit = dynamic_cast<QLineEdit*>(target);
15 QComboBox * comboBox = dynamic_cast<QComboBox*>(target);
16 if(lineEdit) lineEdit->setFocus(Qt::MouseFocusReason);
17 if(comboBox) comboBox->setFocus(Qt::MouseFocusReason);
18 }
19}
20Mouse Press (2)
21Tooltip Change (184)
22Paint (12)
23Mouse Move (5)
24Mouse Move (5)
25Mouse Release (3)
26#include <QApplication>
27#include <QMainWindow>
28#include <QMouseEvent>
29#include <QSlider>
30#include <QTimer>
31
32int main(int argc, char *argv[])
33{
34 QApplication a(argc, argv);
35
36 QMainWindow m;
37 QSlider *slider = new QSlider();
38 m.setCentralWidget(slider);
39 m.resize(100, 100);
40 m.show();
41
42 QTimer::singleShot(1000, [&](){
43 a.postEvent(slider, new QMouseEvent(QEvent::MouseButtonPress, QPoint(50,50), m.mapToGlobal(QPoint(50,50)), Qt::LeftButton, Qt::LeftButton, Qt::NoModifier));
44 a.postEvent(slider, new QMouseEvent(QEvent::MouseButtonRelease, QPoint(50,50), m.mapToGlobal(QPoint(50,50)), Qt::LeftButton, Qt::NoButton, Qt::NoModifier));
45 });
46
47 return a.exec();
48}
49This example decreases the slider value with 1 tick after 1 second.
Note that it is important to pass Qt::NoButton as buttons parameters to the QEvent::MouseButtonRelease event, otherwise the slider will continue moving to the current mouse position (see QAbstractSlider::setRepeatAction), as QSlider thinks the button is still pressed. I assume this behaviour is what you call 'press-and-hold'.
QUESTION
Does QtNetworkAuth support PKCE
Asked 2022-Mar-16 at 08:26I use Qt5. I did not find any documentation on how to enable PKCE when using QOAuth2AuthorizationCodeFlow.
If so, please provide the link. If there is no support, how can this feature be added to it?
I added code_challenge and code_challenge_method, but it is not enough. I don't know what the next step is.
1#include <QtNetworkAuth/QtNetworkAuth>
2
3void loginHelper()
4{
5 auto* authFlow = new QOAuth2AuthorizationCodeFlow;
6 QObject::connect(authFlow, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser, &QDesktopServices::openUrl);
7 authFlow->setScope("openid profile email mobile");
8 authFlow->setAuthorizationUrl(QUrl("https://accounts.XYZ.com/core/connect/authorize")); // url is changed
9 authFlow->setClientIdentifier("desktop.test");
10 authFlow->setAccessTokenUrl(QUrl("https://accounts.XYZ.com/core/connect/token")); // url is changed
11 authFlow->setClientIdentifierSharedKey("0323af0d-efe2-fcec-b450-72f102530a77");
12 authFlow->setModifyParametersFunction([=](QAbstractOAuth::Stage, QVariantMap* params)
13 {
14 params->insert("code_challenge", "1Kht0Wkyt_WvDngoM_AIOYPPOWG8lzVG1g1zk28TjSo");
15 params->insert("code_challenge_method", "S256");
16 });
17 auto* replyHandler = new QOAuthHttpServerReplyHandler(1234); // port number
18 authFlow->setReplyHandler(replyHandler);
19 QObject::connect(authFlow, &QOAuth2AuthorizationCodeFlow::granted, []()
20 {
21 qDebug() << "Access Granted!";
22 });
23 authFlow->grant();
24}
25ANSWER
Answered 2022-Mar-15 at 12:34TL;DR Yes, and you are using it.
Reading the new flow you notice there are three new parameters used by PKCE, code_verifier, code_challenge and code_challenge_method.
These are used in your code, so you are using PKCE already.
QUESTION
Changing QThread variable from a sub window
Asked 2022-Mar-08 at 18:46I am writing a WebCam Gui, which is supposed to take pictures and manipulate with WebCam parameters. After the video stream is activated on the main GUI window, an additional window can be opened to change the WebCamera parameters Screenshot 1, Screenshot 2.
I am using Qthread to stream on QLabel. Also, I was able to set the initial camera parameters on the camera properties' changing window. My problem is changing the Exposure parameter by using a slider on the sub-window and seeing results in real-time on the main window.
Please see the code.
1import sys
2from PyQt5.QtWidgets import *
3from PyQt5 import uic
4from PyQt5.QtCore import *
5from PyQt5.QtGui import *
6import cv2
7
8
9class MainFrame(QMainWindow):
10
11 def __init__(self):
12 super(MainFrame, self).__init__()
13 # Loading UI
14
15 uic.loadUi("MainFrame.ui", self)
16
17 # Remove maximize button to prevent crushing
18 self.setWindowFlags(Qt.WindowCloseButtonHint | Qt.WindowMinimizeButtonHint)
19
20 # Define Widgets
21 self.Video_Feed = self.findChild(QLabel, 'Video_Feed')
22 self.Case_Name = self.findChild(QLineEdit, "Case_Name")
23 self.Pictures_List = self.findChild(QListWidget, "Pictures_List")
24 self.Start_Video = self.findChild(QAction, 'actionStart_Video')
25 self.Start_Video.setShortcut('Shift+S')
26 self.Stop_Video = self.findChild(QAction, 'actionStop_Video')
27 self.Stop_Video.setShortcut('Shift+F')
28 self.Take_a_Picture = self.findChild(QAction, 'actionTake_a_picture')
29 self.Take_a_Timed_Picture = self.findChild(QAction, 'actionTake_a_timed_picture')
30 self.Camera_Properties = self.findChild(QAction, 'actionProperties')
31
32 # Initializing Video
33 self.Start_Video.triggered.connect(self.Start_Video_Clicked)
34 self.Stop_Video.triggered.connect(self.Stop_Video_Clicked)
35 self.Camera_Properties.triggered.connect(self.Camera_Properties_Clicked)
36
37 def Video_Feed_Update(self, Image):
38 self.Video_Feed.setPixmap(QPixmap.fromImage(Image))
39
40 def Start_Video_Clicked(self):
41 self.Video_Feed_is_Running = True
42 self.thread = QThread()
43 self.Video_Thread = Worker()
44 self.Video_Thread.moveToThread(self.thread)
45 self.Video_Thread.ImageUpdate.connect(self.Video_Feed_Update)
46 self.thread.started.connect(self.Video_Thread.run)
47 self.thread.start()
48
49 def Stop_Video_Clicked(self):
50 self.Video_Thread.stop_video()
51 self.Video_Feed.setText("Your video starts here")
52
53 def Camera_Properties_Clicked(self):
54 self.CP = CameraParameters()
55 Initial_Exposure = self.Video_Thread.Camera_Initial_Parameters()
56 self.CP.Setup_Exposure(int(Initial_Exposure))
57 self.CP.Exposure_Calibration.connect(self.Video_Thread.Exposure_update)
58 self.CP.show()
59
60
61class Worker(QObject):
62 ImageUpdate = pyqtSignal(QImage)
63
64 def run(self):
65 self.ThreadActive = True
66 self.Capture = cv2.VideoCapture(1, cv2.CAP_DSHOW)
67 self.Capture.set(3, 1920)
68 self.Capture.set(4, 1080)
69 while self.ThreadActive:
70 ret, frame = self.Capture.read()
71 if ret:
72 image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
73 # Converting Video into QT5 readable format
74 qt_video_format = QImage(image.data, image.shape[1], image.shape[0], QImage.Format_RGB888)
75 qt_picture = qt_video_format.scaled(1280, 720, Qt.KeepAspectRatio)
76 self.ImageUpdate.emit(qt_picture)
77
78 def stop_video(self):
79 self.ThreadActive = False
80 self.Capture.release()
81
82 def Camera_Initial_Parameters(self):
83 return self.Capture.get(cv2.CAP_PROP_EXPOSURE)
84
85 def Exposure_update(self, value):
86 self.Capture.set(cv2.CAP_PROP_EXPOSURE, value)
87
88
89class CameraParameters(QDialog):
90 Exposure_Calibration = pyqtSignal(int)
91
92 def __init__(self):
93 super().__init__()
94 uic.loadUi('Cam_Parameters.ui', self)
95
96 # Sliders
97 self.Exposure_Slider = self.findChild(QSlider, 'ExposureSlider')
98 self.Exposure_Slider.setRange(-10, 10)
99 self.White_Balance_Slider = self.findChild(QSlider, 'WBSlider')
100 self.White_Balance_Slider.setMinimum(-10)
101 self.White_Balance_Slider.setMaximum(10)
102 self.Brightness_Slider = self.findChild(QSlider, 'BrightnessSlider')
103 self.Brightness_Slider.setMinimum(0)
104 self.Brightness_Slider.setMaximum(300)
105 self.Saturation_Slider = self.findChild(QSlider, 'SaturationSlider')
106 self.Saturation_Slider.setMinimum(0)
107 self.Saturation_Slider.setMaximum(300)
108 self.Contrast_Slider = self.findChild(QSlider, 'ContrastSlider')
109 self.Contrast_Slider.setMinimum(-10)
110 self.Contrast_Slider.setMaximum(10)
111 self.Gamma_Slider = self.findChild(QSlider, 'GammaSlider')
112 self.Gamma_Slider.setMinimum(-10)
113 self.Gamma_Slider.setMaximum(10)
114 self.Sharpness_Slider = self.findChild(QSlider, 'SharpnessSlider')
115 self.Sharpness_Slider.setMinimum(0)
116 self.Sharpness_Slider.setMaximum(100)
117 # Sliders values
118 self.Exposure_Value = self.findChild(QLabel, 'Exposure_Value')
119 self.White_Balance_Value = self.findChild(QLabel, 'WB_value')
120 self.Brightness_Value = self.findChild(QLabel, 'Brightness_value')
121 self.Saturation_Value = self.findChild(QLabel, 'Saturation_value')
122 self.Contrast_Value = self.findChild(QLabel, 'Contrast_value')
123 self.Gamma_Value = self.findChild(QLabel, 'Gamma_value')
124 self.Sharpness_Value = self.findChild(QLabel, 'Sharpness_value')
125
126 # Connections
127 self.Exposure_Slider.valueChanged.connect(self.Exposure_sliding)
128
129 def Setup_Exposure(self, value):
130 self.Exposure_Slider.setValue(value)
131 self.Exposure_Value.setText(str(value))
132
133 def Exposure_sliding(self, value):
134 self.Exposure_Value.setText(str(value))
135 self.Exposure_Calibration.emit(value)
136
137
138if __name__ == "__main__":
139 App = QApplication(sys.argv)
140 Root = MainFrame()
141 Root.show()
142 sys.exit(App.exec())
143
144Cam_Parameters.ui, MainFrame.ui for the GUI
ANSWER
Answered 2022-Mar-07 at 17:05I admit I don't know why this worked, but changing the connect to a lambda function did the trick.
1import sys
2from PyQt5.QtWidgets import *
3from PyQt5 import uic
4from PyQt5.QtCore import *
5from PyQt5.QtGui import *
6import cv2
7
8
9class MainFrame(QMainWindow):
10
11 def __init__(self):
12 super(MainFrame, self).__init__()
13 # Loading UI
14
15 uic.loadUi("MainFrame.ui", self)
16
17 # Remove maximize button to prevent crushing
18 self.setWindowFlags(Qt.WindowCloseButtonHint | Qt.WindowMinimizeButtonHint)
19
20 # Define Widgets
21 self.Video_Feed = self.findChild(QLabel, 'Video_Feed')
22 self.Case_Name = self.findChild(QLineEdit, "Case_Name")
23 self.Pictures_List = self.findChild(QListWidget, "Pictures_List")
24 self.Start_Video = self.findChild(QAction, 'actionStart_Video')
25 self.Start_Video.setShortcut('Shift+S')
26 self.Stop_Video = self.findChild(QAction, 'actionStop_Video')
27 self.Stop_Video.setShortcut('Shift+F')
28 self.Take_a_Picture = self.findChild(QAction, 'actionTake_a_picture')
29 self.Take_a_Timed_Picture = self.findChild(QAction, 'actionTake_a_timed_picture')
30 self.Camera_Properties = self.findChild(QAction, 'actionProperties')
31
32 # Initializing Video
33 self.Start_Video.triggered.connect(self.Start_Video_Clicked)
34 self.Stop_Video.triggered.connect(self.Stop_Video_Clicked)
35 self.Camera_Properties.triggered.connect(self.Camera_Properties_Clicked)
36
37 def Video_Feed_Update(self, Image):
38 self.Video_Feed.setPixmap(QPixmap.fromImage(Image))
39
40 def Start_Video_Clicked(self):
41 self.Video_Feed_is_Running = True
42 self.thread = QThread()
43 self.Video_Thread = Worker()
44 self.Video_Thread.moveToThread(self.thread)
45 self.Video_Thread.ImageUpdate.connect(self.Video_Feed_Update)
46 self.thread.started.connect(self.Video_Thread.run)
47 self.thread.start()
48
49 def Stop_Video_Clicked(self):
50 self.Video_Thread.stop_video()
51 self.Video_Feed.setText("Your video starts here")
52
53 def Camera_Properties_Clicked(self):
54 self.CP = CameraParameters()
55 Initial_Exposure = self.Video_Thread.Camera_Initial_Parameters()
56 self.CP.Setup_Exposure(int(Initial_Exposure))
57 self.CP.Exposure_Calibration.connect(self.Video_Thread.Exposure_update)
58 self.CP.show()
59
60
61class Worker(QObject):
62 ImageUpdate = pyqtSignal(QImage)
63
64 def run(self):
65 self.ThreadActive = True
66 self.Capture = cv2.VideoCapture(1, cv2.CAP_DSHOW)
67 self.Capture.set(3, 1920)
68 self.Capture.set(4, 1080)
69 while self.ThreadActive:
70 ret, frame = self.Capture.read()
71 if ret:
72 image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
73 # Converting Video into QT5 readable format
74 qt_video_format = QImage(image.data, image.shape[1], image.shape[0], QImage.Format_RGB888)
75 qt_picture = qt_video_format.scaled(1280, 720, Qt.KeepAspectRatio)
76 self.ImageUpdate.emit(qt_picture)
77
78 def stop_video(self):
79 self.ThreadActive = False
80 self.Capture.release()
81
82 def Camera_Initial_Parameters(self):
83 return self.Capture.get(cv2.CAP_PROP_EXPOSURE)
84
85 def Exposure_update(self, value):
86 self.Capture.set(cv2.CAP_PROP_EXPOSURE, value)
87
88
89class CameraParameters(QDialog):
90 Exposure_Calibration = pyqtSignal(int)
91
92 def __init__(self):
93 super().__init__()
94 uic.loadUi('Cam_Parameters.ui', self)
95
96 # Sliders
97 self.Exposure_Slider = self.findChild(QSlider, 'ExposureSlider')
98 self.Exposure_Slider.setRange(-10, 10)
99 self.White_Balance_Slider = self.findChild(QSlider, 'WBSlider')
100 self.White_Balance_Slider.setMinimum(-10)
101 self.White_Balance_Slider.setMaximum(10)
102 self.Brightness_Slider = self.findChild(QSlider, 'BrightnessSlider')
103 self.Brightness_Slider.setMinimum(0)
104 self.Brightness_Slider.setMaximum(300)
105 self.Saturation_Slider = self.findChild(QSlider, 'SaturationSlider')
106 self.Saturation_Slider.setMinimum(0)
107 self.Saturation_Slider.setMaximum(300)
108 self.Contrast_Slider = self.findChild(QSlider, 'ContrastSlider')
109 self.Contrast_Slider.setMinimum(-10)
110 self.Contrast_Slider.setMaximum(10)
111 self.Gamma_Slider = self.findChild(QSlider, 'GammaSlider')
112 self.Gamma_Slider.setMinimum(-10)
113 self.Gamma_Slider.setMaximum(10)
114 self.Sharpness_Slider = self.findChild(QSlider, 'SharpnessSlider')
115 self.Sharpness_Slider.setMinimum(0)
116 self.Sharpness_Slider.setMaximum(100)
117 # Sliders values
118 self.Exposure_Value = self.findChild(QLabel, 'Exposure_Value')
119 self.White_Balance_Value = self.findChild(QLabel, 'WB_value')
120 self.Brightness_Value = self.findChild(QLabel, 'Brightness_value')
121 self.Saturation_Value = self.findChild(QLabel, 'Saturation_value')
122 self.Contrast_Value = self.findChild(QLabel, 'Contrast_value')
123 self.Gamma_Value = self.findChild(QLabel, 'Gamma_value')
124 self.Sharpness_Value = self.findChild(QLabel, 'Sharpness_value')
125
126 # Connections
127 self.Exposure_Slider.valueChanged.connect(self.Exposure_sliding)
128
129 def Setup_Exposure(self, value):
130 self.Exposure_Slider.setValue(value)
131 self.Exposure_Value.setText(str(value))
132
133 def Exposure_sliding(self, value):
134 self.Exposure_Value.setText(str(value))
135 self.Exposure_Calibration.emit(value)
136
137
138if __name__ == "__main__":
139 App = QApplication(sys.argv)
140 Root = MainFrame()
141 Root.show()
142 sys.exit(App.exec())
143
144self.CP.Exposure_Calibration.connect(lambda x: self.Video_Thread.Exposure_update(x))
145QUESTION
Is there a way to access QMainWindowPrivate or QMainWindowLayout?
Asked 2022-Feb-27 at 14:43I'm using Qt5 and I am trying to do this:
1setCentralWidget(wid);
2...
3setCentralWidget(nullptr); // i don't want it to do deleteLater() for my wid variable
4...
5setCentralWidget(wid);
6The problem is that, when I call setCentralWidget(nullptr), it does deleteLater() for my wid variable.
So, I found a way to use setCentralWidget() without deleting the wid variable:
1setCentralWidget(wid);
2...
3setCentralWidget(nullptr); // i don't want it to do deleteLater() for my wid variable
4...
5setCentralWidget(wid);
6Q_D(QMainWindow);
7d->layout->setCentralWidget(nullptr);
8But the question is: How to use private headers or widgets or whatever? I mean, I don't have access to QMainWindowPrivate or QMainWindowLayout, because they are private. So is there a way to access them?
ANSWER
Answered 2022-Feb-27 at 13:32OP's issue is caused by using setCentralWidget(nullptr);.
QMainWindow::setCentralWiget():
Sets the given widget to be the main window's central widget.
Note: QMainWindow takes ownership of the widget pointer and deletes it at the appropriate time.
(Emphasis mine.)
Hence, for
1setCentralWidget(wid);
2...
3setCentralWidget(nullptr); // i don't want it to do deleteLater() for my wid variable
4...
5setCentralWidget(wid);
6Q_D(QMainWindow);
7d->layout->setCentralWidget(nullptr);
8setCentralWidget(wid);
9...
10setCentralWidget(nullptr);
11it has to be expected that the QMainWindow will delete the wid. Otherwise, the wid instance could become orphaned i.e. a memory leak.
However, OPs issue can be solved without adventurous accesses to internals of QMainWindow (which is neither intended nor necessary).
In fact, there is an alternative to remove the central widget and take over the ownership again – QMainWindow::takeCentralWidget():
Removes the central widget from this main window.
The ownership of the removed widget is passed to the caller.
(Emphasis mine, again.)
An MCVE to demonstrate this:
1setCentralWidget(wid);
2...
3setCentralWidget(nullptr); // i don't want it to do deleteLater() for my wid variable
4...
5setCentralWidget(wid);
6Q_D(QMainWindow);
7d->layout->setCentralWidget(nullptr);
8setCentralWidget(wid);
9...
10setCentralWidget(nullptr);
11#include <QtWidgets>
12
13// main application
14
15int main(int argc, char **argv)
16{
17 qDebug() << "Qt Version:" << QT_VERSION_STR;
18 QApplication app(argc, argv);
19 // setup GUI
20 QMainWindow qWinMain;
21 qWinMain.setWindowTitle("QMainWindow::takeCentralWidget");
22 QLabel *pQLbl = new QLabel("The\ncentral\nwidget");
23 pQLbl->setAlignment(Qt::AlignCenter);
24 qWinMain.setCentralWidget(pQLbl);
25 qWinMain.show();
26 QTimer qTimer;
27 qTimer.setInterval(1000);
28 uint n = 10;
29 // install signal handlers
30 QObject::connect(&qTimer, &QTimer::timeout,
31 [&]() {
32 --n;
33 if (!n) {
34 qWinMain.setCentralWidget(nullptr);
35 app.quit();
36 } else if (n & 1) qWinMain.setCentralWidget(pQLbl);
37 else qWinMain.takeCentralWidget();
38 });
39 // runtime loop
40 qTimer.start();
41 return app.exec();
42}
43Output:
QUESTION
Build and run a Qt application on macOS via Bazel
Asked 2022-Feb-16 at 17:13I tried to build and run a Qt5 (5.15.2) application on macOS (10.15.7) using Bazel 5.0.0. Unfortunately, I run into some problems. The building part seems to work, but not the run part.
I installed Qt5 on my machine using Homebrew:
1brew install qt@5
2brew link qt@5
3I adapted https://github.com/justbuchanan/bazel_rules_qt/ to my needs. See this PR. When I try to run:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4I receive the runtime error:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5Steps to reproduce the issue:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12Nevertheless, building everything using bazel build --cxxopt=-std=c++17 //... seems to work.
I am not 100% sure if the link options -F/usr/local/opt/qt5/Frameworks and -framework QtCore, etc. are correct.
Maybe someone can confirm this.
Did I use the correct link options?
For me, it is a bit unclear what dependencies the main binary expects. I tried to copy QtCore.framework to the location of the main binary manually but this does not change the error message.
What files does the main binary expect?
If I try to run macdeployqt on my main binary I get also some errors. I do within my workspace root dir a cd bazel-bin/tests/qt_resource and run then /usr/local/opt/qt5/bin/macdeployqt main:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12ERROR: Could not find bundle binary for "main"
13ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
14ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
15ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
16WARNING:
17WARNING: Could not find any external Qt frameworks to deploy in "main"
18WARNING: Perhaps macdeployqt was already used on "main" ?
19WARNING: If so, you will need to rebuild "main" before trying again.
20ERROR: Could not find bundle binary for "main"
21ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/strip: can't open file: (No such file or directory)\n"
22ERROR: ""
23My hope was that macdeployqt would collect all needed resources for me. Any idea why this is not working?
How can macdeployqt be used to collect all needed dependencies for the main binary?
If I convert my main to an app via lipo -create -output universall_app main and do then a /usr/local/opt/qt5/bin/macdeployqt universall_app I get the same error message.
The CMake approach
To make sure that there is no general problem with my system setup I tried to use CMake to build a Qt5 application:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12ERROR: Could not find bundle binary for "main"
13ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
14ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
15ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
16WARNING:
17WARNING: Could not find any external Qt frameworks to deploy in "main"
18WARNING: Perhaps macdeployqt was already used on "main" ?
19WARNING: If so, you will need to rebuild "main" before trying again.
20ERROR: Could not find bundle binary for "main"
21ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/strip: can't open file: (No such file or directory)\n"
22ERROR: ""
23git clone https://github.com/euler0/mini-cmake-qt.git
24cmake -DCMAKE_PREFIX_PATH=/usr/local/opt/qt5 .
25make -j
26This produces an example.app.
With a double click on this application bundle,
the application can be started.
This worked on my system.
Future directions
It seems that rules_apple can be used to create an application bundle.
I am not sure if I need to transform my Qt application binary to an app bundle to be able to execute it.
One could use --sandbox_debugto identify what Bazel is doing and dtruss for the CMake version to compare the differences.
I am currently not sure what trying to do next and hope for an easy solution. I am also fine with a Qt6 solution.
Update: Alternative Answer
It would also be helpful if someone can point out how to build a minimal Qt application using make only on macOS and a brew installed Qt5 or tell me what the linker and compiler options must look like.
ANSWER
Answered 2022-Feb-16 at 17:13I followed your steps with Mac OSX 10.15.7, Qt (installed by homebrew) 5.15.1 and both bazel 4.2.2-homebrew and 5.0.0-homebrew and initially I could not build the project from git:
* 3fe5f6c - (4 weeks ago) Add macOS support — Vertexwahn (HEAD -> add-macos-support, origin/add-macos-support)
This is the result that I get when building:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12ERROR: Could not find bundle binary for "main"
13ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
14ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
15ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
16WARNING:
17WARNING: Could not find any external Qt frameworks to deploy in "main"
18WARNING: Perhaps macdeployqt was already used on "main" ?
19WARNING: If so, you will need to rebuild "main" before trying again.
20ERROR: Could not find bundle binary for "main"
21ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/strip: can't open file: (No such file or directory)\n"
22ERROR: ""
23git clone https://github.com/euler0/mini-cmake-qt.git
24cmake -DCMAKE_PREFIX_PATH=/usr/local/opt/qt5 .
25make -j
26 % bazel build --cxxopt=-std=c++17 //...
27 DEBUG: /private/var/tmp/_bazel_home/761aafaa2237a9607dd915f1f52bca3e/external/com_justbuchanan_rules_qt/qt_configure.bzl:43:14: Installation available on the default path: /usr/local/opt/qt5
28 INFO: Analyzed 14 targets (0 packages loaded, 0 targets configured).
29 INFO: Found 14 targets...
30 ERROR: /Users/home/Git/my_repo/bazel_rules_qt/tests/qt_qml/BUILD:4:10: Compiling tests/qt_qml/main.cc failed: (Aborted): wrapped_clang failed: error executing command external/local_config_cc/wrapped_clang '-D_FORTIFY_SOURCE=1' -fstack-protector -fcolor-diagnostics -Wall -Wthread-safety -Wself-assign -fno-omit-frame-pointer -O0 -DDEBUG '-std=c++11' ... (remaining 38 argument(s) skipped)
31
32 Use --sandbox_debug to see verbose messages from the sandbox
33 tests/qt_qml/main.cc:1:10: fatal error: 'QtQml/QQmlApplicationEngine' file not found
34 #include <QtQml/QQmlApplicationEngine>
35 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
36 1 error generated.
37 Error in child process '/usr/bin/xcrun'. 1
38 INFO: Elapsed time: 0,594s, Critical Path: 0,32s
39 INFO: 3 processes: 3 internal.
40 FAILED: Build did NOT complete successfully
41After playing around with headers and include paths in qt.BUILD:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12ERROR: Could not find bundle binary for "main"
13ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
14ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
15ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
16WARNING:
17WARNING: Could not find any external Qt frameworks to deploy in "main"
18WARNING: Perhaps macdeployqt was already used on "main" ?
19WARNING: If so, you will need to rebuild "main" before trying again.
20ERROR: Could not find bundle binary for "main"
21ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/strip: can't open file: (No such file or directory)\n"
22ERROR: ""
23git clone https://github.com/euler0/mini-cmake-qt.git
24cmake -DCMAKE_PREFIX_PATH=/usr/local/opt/qt5 .
25make -j
26 % bazel build --cxxopt=-std=c++17 //...
27 DEBUG: /private/var/tmp/_bazel_home/761aafaa2237a9607dd915f1f52bca3e/external/com_justbuchanan_rules_qt/qt_configure.bzl:43:14: Installation available on the default path: /usr/local/opt/qt5
28 INFO: Analyzed 14 targets (0 packages loaded, 0 targets configured).
29 INFO: Found 14 targets...
30 ERROR: /Users/home/Git/my_repo/bazel_rules_qt/tests/qt_qml/BUILD:4:10: Compiling tests/qt_qml/main.cc failed: (Aborted): wrapped_clang failed: error executing command external/local_config_cc/wrapped_clang '-D_FORTIFY_SOURCE=1' -fstack-protector -fcolor-diagnostics -Wall -Wthread-safety -Wself-assign -fno-omit-frame-pointer -O0 -DDEBUG '-std=c++11' ... (remaining 38 argument(s) skipped)
31
32 Use --sandbox_debug to see verbose messages from the sandbox
33 tests/qt_qml/main.cc:1:10: fatal error: 'QtQml/QQmlApplicationEngine' file not found
34 #include <QtQml/QQmlApplicationEngine>
35 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
36 1 error generated.
37 Error in child process '/usr/bin/xcrun'. 1
38 INFO: Elapsed time: 0,594s, Critical Path: 0,32s
39 INFO: 3 processes: 3 internal.
40 FAILED: Build did NOT complete successfully
41 diff --git a/qt.BUILD b/qt.BUILD
42 index 517c8db..8f110b5 100644
43 --- a/qt.BUILD
44 +++ b/qt.BUILD
45 @@ -28,11 +28,12 @@ QT_LIBRARIES = [
46 cc_library(
47 name = "qt_%s_osx" % name,
48 # When being on Windows this glob will be empty
49 - hdrs = glob(["%s/**" % include_folder], allow_empty = True),
50 + hdrs = glob(["include/%s/**" % include_folder], allow_empty = True),
51 includes = ["."],
52 linkopts = ["-F/usr/local/opt/qt5/lib"] + [
53 "-framework %s" % library_name.replace("5", "") # macOS qt libs do not contain a 5 - e.g. instead of Qt5Core the lib is called QtCore
54 ],
55 + strip_include_prefix= "include"
56 # Available from Bazel 4.0.0
57 # target_compatible_with = ["@platforms//os:osx"],
58 )
59I could build and run the project:
1brew install qt@5
2brew link qt@5
3bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
4dyld: Symbol not found: __ZN10QByteArray6_emptyE
5# brew install bazel # Install Bazel
6# brew install qt@5 # Install Qt5
7git clone https://github.com/Vertexwahn/bazel_rules_qt.git
8cd bazel_rules_qt
9git checkout add-macos-support
10bazel build --cxxopt=-std=c++17 //... # should work
11bazel run --cxxopt=-std=c++17 //tests/qt_resource:main # should give you the error message
12ERROR: Could not find bundle binary for "main"
13ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
14ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
15ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: (No such file or directory)\n"
16WARNING:
17WARNING: Could not find any external Qt frameworks to deploy in "main"
18WARNING: Perhaps macdeployqt was already used on "main" ?
19WARNING: If so, you will need to rebuild "main" before trying again.
20ERROR: Could not find bundle binary for "main"
21ERROR: "error: /Library/Developer/CommandLineTools/usr/bin/strip: can't open file: (No such file or directory)\n"
22ERROR: ""
23git clone https://github.com/euler0/mini-cmake-qt.git
24cmake -DCMAKE_PREFIX_PATH=/usr/local/opt/qt5 .
25make -j
26 % bazel build --cxxopt=-std=c++17 //...
27 DEBUG: /private/var/tmp/_bazel_home/761aafaa2237a9607dd915f1f52bca3e/external/com_justbuchanan_rules_qt/qt_configure.bzl:43:14: Installation available on the default path: /usr/local/opt/qt5
28 INFO: Analyzed 14 targets (0 packages loaded, 0 targets configured).
29 INFO: Found 14 targets...
30 ERROR: /Users/home/Git/my_repo/bazel_rules_qt/tests/qt_qml/BUILD:4:10: Compiling tests/qt_qml/main.cc failed: (Aborted): wrapped_clang failed: error executing command external/local_config_cc/wrapped_clang '-D_FORTIFY_SOURCE=1' -fstack-protector -fcolor-diagnostics -Wall -Wthread-safety -Wself-assign -fno-omit-frame-pointer -O0 -DDEBUG '-std=c++11' ... (remaining 38 argument(s) skipped)
31
32 Use --sandbox_debug to see verbose messages from the sandbox
33 tests/qt_qml/main.cc:1:10: fatal error: 'QtQml/QQmlApplicationEngine' file not found
34 #include <QtQml/QQmlApplicationEngine>
35 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
36 1 error generated.
37 Error in child process '/usr/bin/xcrun'. 1
38 INFO: Elapsed time: 0,594s, Critical Path: 0,32s
39 INFO: 3 processes: 3 internal.
40 FAILED: Build did NOT complete successfully
41 diff --git a/qt.BUILD b/qt.BUILD
42 index 517c8db..8f110b5 100644
43 --- a/qt.BUILD
44 +++ b/qt.BUILD
45 @@ -28,11 +28,12 @@ QT_LIBRARIES = [
46 cc_library(
47 name = "qt_%s_osx" % name,
48 # When being on Windows this glob will be empty
49 - hdrs = glob(["%s/**" % include_folder], allow_empty = True),
50 + hdrs = glob(["include/%s/**" % include_folder], allow_empty = True),
51 includes = ["."],
52 linkopts = ["-F/usr/local/opt/qt5/lib"] + [
53 "-framework %s" % library_name.replace("5", "") # macOS qt libs do not contain a 5 - e.g. instead of Qt5Core the lib is called QtCore
54 ],
55 + strip_include_prefix= "include"
56 # Available from Bazel 4.0.0
57 # target_compatible_with = ["@platforms//os:osx"],
58 )
59 % bazel build --cxxopt=-std=c++17 //...
60 DEBUG: /private/var/tmp/_bazel_home/761aafaa2237a9607dd915f1f52bca3e/external/com_justbuchanan_rules_qt/qt_configure.bzl:43:14: Installation available on the default path: /usr/local/opt/qt5
61 INFO: Analyzed 14 targets (1 packages loaded, 7422 targets configured).
62 INFO: Found 14 targets...
63 INFO: Elapsed time: 11,761s, Critical Path: 7,23s
64 INFO: 3 processes: 1 internal, 2 darwin-sandbox.
65 INFO: Build completed successfully, 3 total actions
66 % bazel run --cxxopt=-std=c++17 //tests/qt_resource:main
67 DEBUG: /private/var/tmp/_bazel_home/761aafaa2237a9607dd915f1f52bca3e/external/com_justbuchanan_rules_qt/qt_configure.bzl:43:14: Installation available on the default path: /usr/local/opt/qt5
68 INFO: Analyzed target //tests/qt_resource:main (0 packages loaded, 0 targets configured).
69 INFO: Found 1 target...
70 Target //tests/qt_resource:main up-to-date:
71 bazel-bin/tests/qt_resource/main
72 INFO: Elapsed time: 3,657s, Critical Path: 0,00s
73 INFO: 1 process: 1 internal.
74 INFO: Build completed successfully, 1 total action
75 INFO: Build completed successfully, 1 total action
76 opened resource file
77 file1
78Related to your question whether the linker options are correct
-F/usr/local/opt/qt5/Frameworks -framework QtCore
Yes they are correct, you could alternatively use -F/usr/local/opt/qt5/lib (as you are already using in qt.BUILD) as all the files under the Frameworks folder are links to the lib folder.
With macdeployqt and lipo I get the same results as in the OP even after the test is running successfully.
QUESTION
CMake: How to compile with different library versions of Qt?
Asked 2022-Feb-15 at 20:06How do you get CMake to compile conditionally with Qt4.8 or Qt5? In other words, if Qt5 is available then compile with Qt5. Otherwise if Qt4.8 is available use that.
In my CMake, I have:
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2This works fine with my Qt5 builds, but how do I get the same software to build with Qt4.8?
I need something that contains the major version number, eg.:
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2find_package(Qt $QT_VERSION_MAJOR...)
3or to use a condition, such as:
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2find_package(Qt $QT_VERSION_MAJOR...)
3result = find_package(Qt 5...)
4if (!result) then find_package(Qt4 ...)
5or somehow detect the currently install Qt version.
The error I get for the machine with Qt4.8 installed is (unsurprisingly):
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2find_package(Qt $QT_VERSION_MAJOR...)
3result = find_package(Qt 5...)
4if (!result) then find_package(Qt4 ...)
5CMake Error at CMakeLists.txt:54 (find_package):
6 By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
7 asked CMake to find a package configuration file provided by "Qt5", but
8 CMake did not find one.
9
10 Could not find a package configuration file provided by "Qt5" with any of
11 the following names:
12
13 Qt5Config.cmake
14What is the best approach here?
ANSWER
Answered 2022-Feb-15 at 20:06Automatically selecting an available version of Qt is fairly easy with the NAME option of the find_package command. The problem is that Qt4 and Qt5 have different names for the same modules.
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2find_package(Qt $QT_VERSION_MAJOR...)
3result = find_package(Qt 5...)
4if (!result) then find_package(Qt4 ...)
5CMake Error at CMakeLists.txt:54 (find_package):
6 By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
7 asked CMake to find a package configuration file provided by "Qt5", but
8 CMake did not find one.
9
10 Could not find a package configuration file provided by "Qt5" with any of
11 the following names:
12
13 Qt5Config.cmake
14# We first try to find the main module of Qt4, Qt5 or Qt6
15find_package(QT NAMES Qt4 Qt5 Qt6 REQUIRED)
16set(QT Qt${QT_VERSION_MAJOR})
17
18# We prepare lists of modules and libraries for different
19# versions of Qt
20if (QT_VERSION_MAJOR EQUAL 4)
21 set(APP_QT_MODULES QtCore QtNetwork QtGui QtXml)
22 set(APP_QT_TARGETS Qt4::QtCore Qt4::QtNetwork Qt4::QtGui Qt4::QtXml)
23else ()
24 set(APP_QT_MODULES Core Network PrintSupport Widgets Xml)
25 set(APP_QT_TARGETS ${QT}::Core ${QT}::Network ${QT}::PrintSupport ${QT}::Widgets ${QT}::Xml)
26endif ()
27
28# Here everything is simple - find the modules we need.
29find_package(${QT} REQUIRED ${APP_QT_MODULES})
30
31. . .
32. . .
33
34# And at last don't forget to add libraries.
35add_executable(my_app app.cpp main.cpp window.cpp)
36target_link_libraries(my_app ${APP_QT_TARGETS})
37Another problem is that Qt functions have different names too, for example qt4_add_resources and qt5_add_resources. And this is a good reason to wonder whether or not you really need Qt4 support in your project.
Update
We can make Qt function aliases (as is done in Qt since version 5.15).
1find_package(Qt5 COMPONENTS Core Gui Widgets...)
2find_package(Qt $QT_VERSION_MAJOR...)
3result = find_package(Qt 5...)
4if (!result) then find_package(Qt4 ...)
5CMake Error at CMakeLists.txt:54 (find_package):
6 By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
7 asked CMake to find a package configuration file provided by "Qt5", but
8 CMake did not find one.
9
10 Could not find a package configuration file provided by "Qt5" with any of
11 the following names:
12
13 Qt5Config.cmake
14# We first try to find the main module of Qt4, Qt5 or Qt6
15find_package(QT NAMES Qt4 Qt5 Qt6 REQUIRED)
16set(QT Qt${QT_VERSION_MAJOR})
17
18# We prepare lists of modules and libraries for different
19# versions of Qt
20if (QT_VERSION_MAJOR EQUAL 4)
21 set(APP_QT_MODULES QtCore QtNetwork QtGui QtXml)
22 set(APP_QT_TARGETS Qt4::QtCore Qt4::QtNetwork Qt4::QtGui Qt4::QtXml)
23else ()
24 set(APP_QT_MODULES Core Network PrintSupport Widgets Xml)
25 set(APP_QT_TARGETS ${QT}::Core ${QT}::Network ${QT}::PrintSupport ${QT}::Widgets ${QT}::Xml)
26endif ()
27
28# Here everything is simple - find the modules we need.
29find_package(${QT} REQUIRED ${APP_QT_MODULES})
30
31. . .
32. . .
33
34# And at last don't forget to add libraries.
35add_executable(my_app app.cpp main.cpp window.cpp)
36target_link_libraries(my_app ${APP_QT_TARGETS})
37if (QT_VERSION VERSION_LESS 5.15)
38 macro(qt_wrap_cpp)
39 ${QT}_wrap_cpp(${ARGV})
40 endmacro()
41
42 macro(qt_add_resources)
43 ${QT}_add_resources(${ARGV})
44 endmacro()
45
46 macro(qt_generate_moc)
47 ${QT}_generate_moc(${ARGV})
48 endmacro()
49endif ()
50QUESTION
How to install websockets for Qt 6?
Asked 2022-Feb-10 at 18:45Already referred below old posts, but its solution of installing websockets didn't work in my Ubuntu 21.10.
- Project ERROR: Unknown module(s) in QT: websockets
- Project ERROR: Unknown module(s) in QT: webkitwidgets
This could be probably due to my Qt is 6.2, while the available library is from Qt5, viz. libqt5websockets5-dev.
How to install websocket module properly for the Qt6, to fix below error?
Project ERROR: Unknown module(s) in QT: websockets
ANSWER
Answered 2022-Feb-10 at 18:45When installing Qt via Qt Maintenance Tool, just go to Additional Libraries and check QtWebSockets. It is available in Qt 6.2.x versions.
QUESTION
How to make unique_ptr work with Qt's QHash and QString?
Asked 2022-Jan-29 at 20:52I am learning the intrincacies of unique_ptr.
I have a working example of a std::unordered_map that holds std:string and std::unique_ptr<std::string>.
But I can't make unique_ptr examples with Qt's QString and QHash work. They won't compile mentioning errors like use of deleted function.
How can I make the two last examples work?
Edit 1In case this info is relevant, I am using gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0.
Example 1 (working): unordered_map and string unordered_map_string.h1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21
unordered_map_string.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35
main.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53
CMakeLists.txt
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66
Example 2 (not working): unordered_map and QString
unordered_map_qstring.h
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87
unordered_map_qstring.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101
main.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121
CMakeLists.txt
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138
EDIT 2: compile errors for example 2
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334
Example 3 (not working): QHash and QString
qhash_qstring.h
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355
qhash_qstring.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369
main.cpp
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369#include "qhash_qstring.h"
370
371#include <memory>
372
373int main(int argc, char *argv[])
374{
375 QHashQString testContainer;
376
377 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
378 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
379 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
380
381 testContainer.showItem("key 2");
382 testContainer.showItem("key 3");
383 testContainer.showItem("key 2");
384
385 return 0;
386}
387
CMakeLists.txt
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369#include "qhash_qstring.h"
370
371#include <memory>
372
373int main(int argc, char *argv[])
374{
375 QHashQString testContainer;
376
377 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
378 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
379 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
380
381 testContainer.showItem("key 2");
382 testContainer.showItem("key 3");
383 testContainer.showItem("key 2");
384
385 return 0;
386}
387cmake_minimum_required(VERSION 3.14)
388
389project(qhash_qstring LANGUAGES CXX)
390
391set(CMAKE_INCLUDE_CURRENT_DIR ON)
392
393set(CMAKE_CXX_STANDARD 17)
394set(CMAKE_CXX_STANDARD_REQUIRED ON)
395
396find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
397find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
398
399add_executable(qhash_qstring
400 main.cpp
401 qhash_qstring.h qhash_qstring.cpp
402)
403target_link_libraries(qhash_qstring Qt${QT_VERSION_MAJOR}::Core)
404
Edit 3: compile errors for example 3
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369#include "qhash_qstring.h"
370
371#include <memory>
372
373int main(int argc, char *argv[])
374{
375 QHashQString testContainer;
376
377 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
378 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
379 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
380
381 testContainer.showItem("key 2");
382 testContainer.showItem("key 3");
383 testContainer.showItem("key 2");
384
385 return 0;
386}
387cmake_minimum_required(VERSION 3.14)
388
389project(qhash_qstring LANGUAGES CXX)
390
391set(CMAKE_INCLUDE_CURRENT_DIR ON)
392
393set(CMAKE_CXX_STANDARD 17)
394set(CMAKE_CXX_STANDARD_REQUIRED ON)
395
396find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
397find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
398
399add_executable(qhash_qstring
400 main.cpp
401 qhash_qstring.h qhash_qstring.cpp
402)
403target_link_libraries(qhash_qstring Qt${QT_VERSION_MAJOR}::Core)
404$ make
405[ 33%] Building CXX object CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o
406In file included from /usr/include/x86_64-linux-gnu/qt5/QtCore/QHash:1,
407 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:4,
408 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
409/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h: In instantiation of ‘QHashNode<Key, T>::QHashNode(const Key&, const T&, uint, QHashNode<Key, T>*) [with Key = QString; T = std::unique_ptr<QString>; uint = unsigned int]’:
410/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:562:18: required from ‘QHash<K, V>::Node* QHash<K, V>::createNode(uint, const Key&, const T&, QHash<K, V>::Node**) [with Key = QString; T = std::unique_ptr<QString>; QHash<K, V>::Node = QHashNode<QString, std::unique_ptr<QString> >; uint = unsigned int]’
411/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:762:16: required from ‘T& QHash<K, V>::operator[](const Key&) [with Key = QString; T = std::unique_ptr<QString>]’
412/home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:7:19: required from here
413/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:157:52: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = QString; _Dp = std::default_delete<QString>]’
414 157 | : next(n), h(hash), key(key0), value(value0) {}
415 | ^
416In file included from /usr/include/c++/9/memory:80,
417 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:7,
418 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
419/usr/include/c++/9/bits/unique_ptr.h:414:7: note: declared here
420 414 | unique_ptr(const unique_ptr&) = delete;
421 | ^~~~~~~~~~
422make[2]: *** [CMakeFiles/qhash_qstring.dir/build.make:76: CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o] Error 1
423make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/qhash_qstring.dir/all] Error 2
424make: *** [Makefile:84: all] Error 2
425ANSWER
Answered 2022-Jan-29 at 20:52Example 2 does not compile because std::unordered_map requires its key type to be "hashable": by default, it will use the std::hash template. You can make it work by writing a specialisation for QString:
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369#include "qhash_qstring.h"
370
371#include <memory>
372
373int main(int argc, char *argv[])
374{
375 QHashQString testContainer;
376
377 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
378 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
379 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
380
381 testContainer.showItem("key 2");
382 testContainer.showItem("key 3");
383 testContainer.showItem("key 2");
384
385 return 0;
386}
387cmake_minimum_required(VERSION 3.14)
388
389project(qhash_qstring LANGUAGES CXX)
390
391set(CMAKE_INCLUDE_CURRENT_DIR ON)
392
393set(CMAKE_CXX_STANDARD 17)
394set(CMAKE_CXX_STANDARD_REQUIRED ON)
395
396find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
397find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
398
399add_executable(qhash_qstring
400 main.cpp
401 qhash_qstring.h qhash_qstring.cpp
402)
403target_link_libraries(qhash_qstring Qt${QT_VERSION_MAJOR}::Core)
404$ make
405[ 33%] Building CXX object CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o
406In file included from /usr/include/x86_64-linux-gnu/qt5/QtCore/QHash:1,
407 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:4,
408 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
409/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h: In instantiation of ‘QHashNode<Key, T>::QHashNode(const Key&, const T&, uint, QHashNode<Key, T>*) [with Key = QString; T = std::unique_ptr<QString>; uint = unsigned int]’:
410/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:562:18: required from ‘QHash<K, V>::Node* QHash<K, V>::createNode(uint, const Key&, const T&, QHash<K, V>::Node**) [with Key = QString; T = std::unique_ptr<QString>; QHash<K, V>::Node = QHashNode<QString, std::unique_ptr<QString> >; uint = unsigned int]’
411/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:762:16: required from ‘T& QHash<K, V>::operator[](const Key&) [with Key = QString; T = std::unique_ptr<QString>]’
412/home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:7:19: required from here
413/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:157:52: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = QString; _Dp = std::default_delete<QString>]’
414 157 | : next(n), h(hash), key(key0), value(value0) {}
415 | ^
416In file included from /usr/include/c++/9/memory:80,
417 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:7,
418 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
419/usr/include/c++/9/bits/unique_ptr.h:414:7: note: declared here
420 414 | unique_ptr(const unique_ptr&) = delete;
421 | ^~~~~~~~~~
422make[2]: *** [CMakeFiles/qhash_qstring.dir/build.make:76: CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o] Error 1
423make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/qhash_qstring.dir/all] Error 2
424make: *** [Makefile:84: all] Error 2
425#include <functional> // std::hash
426#include <QHashFunctions> // qHash
427#include <QString>
428
429template<>
430struct std::hash<QString>
431{
432 std::size_t operator()(QString const& s) const noexcept
433 {
434 return qHash(s);
435 }
436};
437Example 3 does not compile because Qt containers use implicit sharing and only support copy semantics, even when inserting new elements. Therefore the compiler is looking for the copy constructor of std::unique_ptr, which is deleted:
1#ifndef UNORDERED_MAP_STRING_H
2#define UNORDERED_MAP_STRING_H
3
4#include <memory>
5#include <string>
6#include <unordered_map>
7
8class UnorderedMapString
9{
10public:
11 UnorderedMapString() {};
12
13 std::unordered_map<std::string, std::unique_ptr<std::string>> container;
14
15 void addItem(std::string aKey, std::unique_ptr<std::string> aValue);
16
17 void showItem(std::string aKey);
18};
19
20#endif // UNORDERED_MAP_STRING_H
21#include "unordered_map_string.h"
22
23#include <iostream>
24
25void UnorderedMapString::addItem(std::string aKey, std::unique_ptr<std::string> aValue)
26{
27 container[aKey] = std::move(aValue);
28}
29
30void UnorderedMapString::showItem(std::string aKey)
31{
32 std::string *aValue = container[aKey].get();
33 std::cout << "Item '" << aKey << "': '" << *aValue << "'\n";
34}
35#include "unordered_map_string.h"
36
37#include <memory>
38
39int main(int argc, char *argv[])
40{
41 UnorderedMapString testContainer;
42
43 testContainer.addItem("key 1", std::make_unique<std::string>("one value"));
44 testContainer.addItem("key 2", std::make_unique<std::string>("two value"));
45 testContainer.addItem("key 3", std::make_unique<std::string>("three value"));
46
47 testContainer.showItem("key 2");
48 testContainer.showItem("key 3");
49 testContainer.showItem("key 2");
50
51 return 0;
52}
53cmake_minimum_required(VERSION 3.14)
54
55project(unique_ptr_string LANGUAGES CXX)
56
57set(CMAKE_INCLUDE_CURRENT_DIR ON)
58
59set(CMAKE_CXX_STANDARD 17)
60set(CMAKE_CXX_STANDARD_REQUIRED ON)
61
62add_executable(unique_ptr_string
63 main.cpp
64 unordered_map_string.h unordered_map_string.cpp
65)
66#ifndef UNORDERED_MAP_QSTRING_H
67#define UNORDERED_MAP_QSTRING_H
68
69#include <QString>
70
71#include <memory>
72#include <unordered_map>
73
74class UnorderedMapQString
75{
76public:
77 UnorderedMapQString() {};
78
79 std::unordered_map<QString, std::unique_ptr<QString>> container;
80
81 void addItem(QString aKey, std::unique_ptr<QString> aValue);
82
83 void showItem(QString aKey);
84};
85
86#endif // UNORDERED_MAP_QSTRING_H
87#include "unordered_map_qstring.h"
88
89#include <iostream>
90
91void UnorderedMapQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
92{
93 container[aKey] = std::move(aValue);
94}
95
96void UnorderedMapQString::showItem(QString aKey)
97{
98 QString *aValue = container[aKey].get();
99 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
100}
101#include "unordered_map_qstring.h"
102
103#include <QString>
104
105#include <memory>
106
107int main(int argc, char *argv[])
108{
109 UnorderedMapQString testContainer;
110
111 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
112 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
113 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
114
115 testContainer.showItem("key 2");
116 testContainer.showItem("key 3");
117 testContainer.showItem("key 2");
118
119 return 0;
120}
121cmake_minimum_required(VERSION 3.14)
122
123project(unique_ptr_qstring LANGUAGES CXX)
124
125set(CMAKE_INCLUDE_CURRENT_DIR ON)
126
127set(CMAKE_CXX_STANDARD 17)
128set(CMAKE_CXX_STANDARD_REQUIRED ON)
129
130find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
131find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
132
133add_executable(unique_ptr_qstring
134 main.cpp
135 unordered_map_qstring.h unordered_map_qstring.cpp
136)
137target_link_libraries(unique_ptr_qstring Qt${QT_VERSION_MAJOR}::Core)
138$ make
139[ 33%] Building CXX object CMakeFiles/unique_ptr_qstring.dir/main.cpp.o
140In file included from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
141/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h: In constructor ‘UnorderedMapQString::UnorderedMapQString()’:
142/home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:12:27: error: use of deleted function ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’
143 12 | UnorderedMapQString() {};
144 | ^
145In file included from /usr/include/c++/9/unordered_map:47,
146 from /usr/include/c++/9/functional:61,
147 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
148 from /usr/include/c++/9/algorithm:71,
149 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
150 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
151 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
152 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
153 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
154 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
155/usr/include/c++/9/bits/unordered_map.h:141:7: note: ‘std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = QString; _Tp = std::unique_ptr<QString>; _Hash = std::hash<QString>; _Pred = std::equal_to<QString>; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >]’ is implicitly deleted because the default definition would be ill-formed:
156 141 | unordered_map() = default;
157 | ^~~~~~~~~~~~~
158/usr/include/c++/9/bits/unordered_map.h:141:7: error: use of deleted function ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
159In file included from /usr/include/c++/9/unordered_map:46,
160 from /usr/include/c++/9/functional:61,
161 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
162 from /usr/include/c++/9/algorithm:71,
163 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
164 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
165 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
166 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
167 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
168 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
169/usr/include/c++/9/bits/hashtable.h:414:7: note: ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true> ’ is implicitly deleted because the default definition would be ill-formed:
170 414 | _Hashtable() = default;
171 | ^~~~~~~~~~
172/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’
173In file included from /usr/include/c++/9/bits/hashtable.h:35,
174 from /usr/include/c++/9/unordered_map:46,
175 from /usr/include/c++/9/functional:61,
176 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
177 from /usr/include/c++/9/algorithm:71,
178 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
179 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
180 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
181 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
182 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
183 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
184/usr/include/c++/9/bits/hashtable_policy.h:1822:5: note: ‘std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’ is implicitly deleted because the default definition would be ill-formed:
185 1822 | _Hashtable_base() = default;
186 | ^~~~~~~~~~~~~~~
187/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’
188/usr/include/c++/9/bits/hashtable_policy.h:1373:7: note: ‘std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing]’ is implicitly deleted because the default definition would be ill-formed:
189 1373 | _Hash_code_base() = default;
190 | ^~~~~~~~~~~~~~~
191/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’
192/usr/include/c++/9/bits/hashtable_policy.h:1096:7: note: ‘std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<QString>]’ is implicitly deleted because the default definition would be ill-formed:
193 1096 | _Hashtable_ebo_helper() = default;
194 | ^~~~~~~~~~~~~~~~~~~~~
195/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::hash()’
196In file included from /usr/include/c++/9/string_view:43,
197 from /usr/include/c++/9/bits/basic_string.h:48,
198 from /usr/include/c++/9/string:55,
199 from /usr/include/c++/9/stdexcept:39,
200 from /usr/include/c++/9/array:39,
201 from /usr/include/c++/9/tuple:39,
202 from /usr/include/c++/9/functional:54,
203 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
204 from /usr/include/c++/9/algorithm:71,
205 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
206 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
207 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
208 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
209 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
210 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
211/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::hash()’ is implicitly deleted because the default definition would be ill-formed:
212 101 | struct hash : __hash_enum<_Tp>
213 | ^~~~
214/usr/include/c++/9/bits/functional_hash.h:101:12: error: no matching function for call to ‘std::__hash_enum<QString, false>::__hash_enum()’
215/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate: ‘std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = QString; bool <anonymous> = false]’
216 82 | __hash_enum(__hash_enum&&);
217 | ^~~~~~~~~~~
218/usr/include/c++/9/bits/functional_hash.h:82:7: note: candidate expects 1 argument, 0 provided
219/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
220 101 | struct hash : __hash_enum<_Tp>
221 | ^~~~
222/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
223 83 | ~__hash_enum();
224 | ^
225In file included from /usr/include/c++/9/bits/hashtable.h:35,
226 from /usr/include/c++/9/unordered_map:46,
227 from /usr/include/c++/9/functional:61,
228 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
229 from /usr/include/c++/9/algorithm:71,
230 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
231 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
232 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
233 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
234 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
235 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
236/usr/include/c++/9/bits/hashtable_policy.h:1096:7: error: use of deleted function ‘std::hash<QString>::~hash()’
237 1096 | _Hashtable_ebo_helper() = default;
238 | ^~~~~~~~~~~~~~~~~~~~~
239In file included from /usr/include/c++/9/string_view:43,
240 from /usr/include/c++/9/bits/basic_string.h:48,
241 from /usr/include/c++/9/string:55,
242 from /usr/include/c++/9/stdexcept:39,
243 from /usr/include/c++/9/array:39,
244 from /usr/include/c++/9/tuple:39,
245 from /usr/include/c++/9/functional:54,
246 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
247 from /usr/include/c++/9/algorithm:71,
248 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
249 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
250 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
251 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
252 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
253 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
254/usr/include/c++/9/bits/functional_hash.h:101:12: note: ‘std::hash<QString>::~hash()’ is implicitly deleted because the default definition would be ill-formed:
255 101 | struct hash : __hash_enum<_Tp>
256 | ^~~~
257/usr/include/c++/9/bits/functional_hash.h:101:12: error: ‘std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = QString; bool <anonymous> = false]’ is private within this context
258/usr/include/c++/9/bits/functional_hash.h:83:7: note: declared private here
259 83 | ~__hash_enum();
260 | ^
261In file included from /usr/include/c++/9/bits/hashtable.h:35,
262 from /usr/include/c++/9/unordered_map:46,
263 from /usr/include/c++/9/functional:61,
264 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
265 from /usr/include/c++/9/algorithm:71,
266 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
267 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
268 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
269 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
270 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
271 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
272/usr/include/c++/9/bits/hashtable_policy.h:1373:7: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
273 1373 | _Hash_code_base() = default;
274 | ^~~~~~~~~~~~~~~
275/usr/include/c++/9/bits/hashtable_policy.h:1093:12: note: ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’ is implicitly deleted because the default definition would be ill-formed:
276 1093 | struct _Hashtable_ebo_helper<_Nm, _Tp, true>
277 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
278/usr/include/c++/9/bits/hashtable_policy.h:1093:12: error: use of deleted function ‘std::hash<QString>::~hash()’
279/usr/include/c++/9/bits/hashtable_policy.h:1822:5: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
280 1822 | _Hashtable_base() = default;
281 | ^~~~~~~~~~~~~~~
282/usr/include/c++/9/bits/hashtable_policy.h:1346:12: note: ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’ is implicitly deleted because the default definition would be ill-formed:
283 1346 | struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
284 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
285 1347 | _Default_ranged_hash, true>
286 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
287/usr/include/c++/9/bits/hashtable_policy.h:1346:12: error: use of deleted function ‘std::__detail::_Hashtable_ebo_helper<1, std::hash<QString>, true>::~_Hashtable_ebo_helper()’
288In file included from /usr/include/c++/9/unordered_map:46,
289 from /usr/include/c++/9/functional:61,
290 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
291 from /usr/include/c++/9/algorithm:71,
292 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
293 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
294 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
295 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
296 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
297 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
298/usr/include/c++/9/bits/hashtable.h:414:7: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
299 414 | _Hashtable() = default;
300 | ^~~~~~~~~~
301In file included from /usr/include/c++/9/bits/hashtable.h:35,
302 from /usr/include/c++/9/unordered_map:46,
303 from /usr/include/c++/9/functional:61,
304 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
305 from /usr/include/c++/9/algorithm:71,
306 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
307 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
308 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
309 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
310 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
311 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
312/usr/include/c++/9/bits/hashtable_policy.h:1770:10: note: ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’ is implicitly deleted because the default definition would be ill-formed:
313 1770 | struct _Hashtable_base
314 | ^~~~~~~~~~~~~~~
315/usr/include/c++/9/bits/hashtable_policy.h:1770:10: error: use of deleted function ‘std::__detail::_Hash_code_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()’
316In file included from /usr/include/c++/9/unordered_map:46,
317 from /usr/include/c++/9/functional:61,
318 from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
319 from /usr/include/c++/9/algorithm:71,
320 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:142,
321 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qchar.h:43,
322 from /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:48,
323 from /usr/include/x86_64-linux-gnu/qt5/QtCore/QString:1,
324 from /home/rodrigo/devel/unordered_map-qstring/unordered_map_qstring.h:4,
325 from /home/rodrigo/devel/unordered_map-qstring/main.cpp:1:
326/usr/include/c++/9/bits/hashtable.h: In instantiation of ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = QString; _Value = std::pair<const QString, std::unique_ptr<QString> >; _Alloc = std::allocator<std::pair<const QString, std::unique_ptr<QString> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<QString>; _H1 = std::hash<QString>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]’:
327/usr/include/c++/9/bits/unordered_map.h:102:11: required from here
328/usr/include/c++/9/bits/hashtable.h:1354:5: error: use of deleted function ‘std::__detail::_Hashtable_base<QString, std::pair<const QString, std::unique_ptr<QString> >, std::__detail::_Select1st, std::equal_to<QString>, std::hash<QString>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()’
329 1354 | }
330 | ^
331make[2]: *** [CMakeFiles/unique_ptr_qstring.dir/build.make:63: CMakeFiles/unique_ptr_qstring.dir/main.cpp.o] Error 1
332make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/unique_ptr_qstring.dir/all] Error 2
333make: *** [Makefile:84: all] Error 2
334#ifndef QHASH_QSTRING_H
335#define QHASH_QSTRING_H
336
337#include <QHash>
338#include <QString>
339
340#include <memory>
341
342class QHashQString
343{
344public:
345 QHashQString() {};
346
347 QHash<QString, std::unique_ptr<QString>> container;
348
349 void addItem(QString aKey, std::unique_ptr<QString> aValue);
350
351 void showItem(QString aKey);
352};
353
354#endif // QHASH_QSTRING_H
355#include "qhash_qstring.h"
356
357#include <iostream>
358
359void QHashQString::addItem(QString aKey, std::unique_ptr<QString> aValue)
360{
361 container[aKey] = std::move(aValue);
362}
363
364void QHashQString::showItem(QString aKey)
365{
366 QString *aValue = container[aKey].get();
367 std::cout << "Item '" << aKey.toStdString() << "': '" << (*aValue).toStdString() << "'\n";
368}
369#include "qhash_qstring.h"
370
371#include <memory>
372
373int main(int argc, char *argv[])
374{
375 QHashQString testContainer;
376
377 testContainer.addItem("key 1", std::make_unique<QString>("one value"));
378 testContainer.addItem("key 2", std::make_unique<QString>("two value"));
379 testContainer.addItem("key 3", std::make_unique<QString>("three value"));
380
381 testContainer.showItem("key 2");
382 testContainer.showItem("key 3");
383 testContainer.showItem("key 2");
384
385 return 0;
386}
387cmake_minimum_required(VERSION 3.14)
388
389project(qhash_qstring LANGUAGES CXX)
390
391set(CMAKE_INCLUDE_CURRENT_DIR ON)
392
393set(CMAKE_CXX_STANDARD 17)
394set(CMAKE_CXX_STANDARD_REQUIRED ON)
395
396find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
397find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
398
399add_executable(qhash_qstring
400 main.cpp
401 qhash_qstring.h qhash_qstring.cpp
402)
403target_link_libraries(qhash_qstring Qt${QT_VERSION_MAJOR}::Core)
404$ make
405[ 33%] Building CXX object CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o
406In file included from /usr/include/x86_64-linux-gnu/qt5/QtCore/QHash:1,
407 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:4,
408 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
409/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h: In instantiation of ‘QHashNode<Key, T>::QHashNode(const Key&, const T&, uint, QHashNode<Key, T>*) [with Key = QString; T = std::unique_ptr<QString>; uint = unsigned int]’:
410/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:562:18: required from ‘QHash<K, V>::Node* QHash<K, V>::createNode(uint, const Key&, const T&, QHash<K, V>::Node**) [with Key = QString; T = std::unique_ptr<QString>; QHash<K, V>::Node = QHashNode<QString, std::unique_ptr<QString> >; uint = unsigned int]’
411/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:762:16: required from ‘T& QHash<K, V>::operator[](const Key&) [with Key = QString; T = std::unique_ptr<QString>]’
412/home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:7:19: required from here
413/usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:157:52: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = QString; _Dp = std::default_delete<QString>]’
414 157 | : next(n), h(hash), key(key0), value(value0) {}
415 | ^
416In file included from /usr/include/c++/9/memory:80,
417 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.h:7,
418 from /home/rodrigo/devel/qhash-qstring/qhash_qstring.cpp:1:
419/usr/include/c++/9/bits/unique_ptr.h:414:7: note: declared here
420 414 | unique_ptr(const unique_ptr&) = delete;
421 | ^~~~~~~~~~
422make[2]: *** [CMakeFiles/qhash_qstring.dir/build.make:76: CMakeFiles/qhash_qstring.dir/qhash_qstring.cpp.o] Error 1
423make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/qhash_qstring.dir/all] Error 2
424make: *** [Makefile:84: all] Error 2
425#include <functional> // std::hash
426#include <QHashFunctions> // qHash
427#include <QString>
428
429template<>
430struct std::hash<QString>
431{
432 std::size_t operator()(QString const& s) const noexcept
433 {
434 return qHash(s);
435 }
436};
437unique_ptr(const unique_ptr&) = delete;
438This example cannot be made to work, it's a fundamental design difference between Qt and standard library containers.
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