ml-cpp | Machine learning C++ code

 by   elastic C++ Version: v8.6.2 License: Non-SPDX

kandi X-RAY | ml-cpp Summary

ml-cpp is a C++ library typically used in Big Data, Spark applications. ml-cpp has no bugs, it has no vulnerabilities and it has low support. However ml-cpp has a Non-SPDX License. You can download it from GitHub.
The ml-cpp repo is a part of Machine Learning for the Elastic Stack, which is available with either a trial or platinum license for the Elastic Stack. This repo only contains the the C++ code that implements the core analytics for machine learning. Code for integrating into Elasticsearch and source for its documentation can be found in the main elasticsearch repo.
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                        ml-cpp has a low active ecosystem.
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                        It has 139 star(s) with 60 fork(s). There are 288 watchers for this library.
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                        It had no major release in the last 6 months.
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                        There are 82 open issues and 202 have been closed. On average issues are closed in 114 days. There are 3 open pull requests and 0 closed requests.
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                        The latest version of ml-cpp is v8.6.2
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                                                            ml-cpp has a Non-SPDX License.
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                                                                                  ml-cpp Key Features

                                                                                  Usage in production requires that you have a license key that permits use of machine learning features. See LICENSE.txt for full information.

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                                                                                  Community Discussions

                                                                                  Trending Discussions on ml-cpp

                                                                                  Illegal map value with envoy v3 about typed_config http connection manager
                                                                                  chevron right
                                                                                  Linking yaml-cpp with conan
                                                                                  chevron right
                                                                                  Meson - How to specify which wxgtk version to use?
                                                                                  chevron right
                                                                                  Issues when installing drake in M1 macOS
                                                                                  chevron right
                                                                                  How to modify a value with yaml-cpp?
                                                                                  chevron right
                                                                                  How to create the top object with yaml-cpp?
                                                                                  chevron right
                                                                                  Yaml_cpp in debug with visual studio 2019 and cmake
                                                                                  chevron right
                                                                                  undefined reference to : what's wrong?
                                                                                  chevron right
                                                                                  How to build a node with yaml-cpp?
                                                                                  chevron right
                                                                                  Editing a QVariantMap from QML
                                                                                  chevron right

                                                                                  QUESTION

                                                                                  Illegal map value with envoy v3 about typed_config http connection manager
                                                                                  Asked 2021-May-25 at 08:03

                                                                                  I am following this tutorial, in order to have a gRPC service transcoded to HTTP. However, it is not up to date, since it uses envoy API v2, but this is not anymore available (I am getting an error saying this), they are now using the v3. Therefore, the syntax is slightly different.

                                                                                  For the v2, this snippet has no syntax error, however, it raises an error saying that the V2 is not available anymore (so it is not usable in the end):

                                                                                   - name: envoy.http_connection_manager
                                                                                          config:
                                                                                              ...
                                                                                  

                                                                                  According to this example, the way of having an HTTP connection manager (which is v3 compliant) would be to do like this, in an envoy.yml configuration file (we are explicitly telling that we are using the v3):

                                                                                  - name: envoy.filters.network.http_connection_manager
                                                                                          typed_config:
                                                                                            "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
                                                                                  
                                                                                  

                                                                                  However, I am getting an Illegal map value error pointing on the "@type": error initializing configuration '/etc/envoy/envoy.yaml': yaml-cpp: error at line 15, column 17: illegal map value

                                                                                  I also have tried to force envoy to use the V2, with the flag --bootstrap-version 2, but it keeps saying that the v2 is no longer in use, so the only way of using envoy now is to use the v3. Do you have experienced the same issue ? My goal is just to have an rGPC service transcoded to HTTP.

                                                                                  If you need more materials to figure out the problem, I uploaded the whole project on GitHub

                                                                                  ANSWER

                                                                                  Answered 2021-May-25 at 08:03

                                                                                  Yes, its a bit of a pain. There's an online envoy config checker that helps a bit in determining exactly which versions ditch backwards compatability.

                                                                                  You have correctly switched from the legacy config to typed_config data.

                                                                                  However, it looks like you inadvertently included a tab in your latest config (line 15) which causes illegal map value.

                                                                                  You also need to migrate clusters/hosts section to load_assignments like this:

                                                                                  load_assignment:
                                                                                    cluster_name: grpc-backend-services
                                                                                    endpoints:
                                                                                    - lb_endpoints:
                                                                                      - endpoint:
                                                                                          address:
                                                                                            socket_address:
                                                                                              address: 127.0.0.1
                                                                                              port_value: 53000
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/67636057

                                                                                  QUESTION

                                                                                  Linking yaml-cpp with conan
                                                                                  Asked 2021-May-17 at 18:59

                                                                                  I'm using yaml-cpp from conan center, in my conan file, yaml-cpp/0.6.3, along with other dependencies.

                                                                                  The rest of the libraries link properly, so there must be something missing in my CMakeLists.txt file. (Maybe some extra definition...?)

                                                                                  Until now, with those lines:

                                                                                  include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
                                                                                  conan_basic_setup()
                                                                                  set(CMAKE_CXX_STANDARD 20)
                                                                                  

                                                                                  It worked fine (For other libraries, like bullet, glm...)

                                                                                  At link time, problems with missing implementation arise:

                                                                                  cmake --build build --config Debug --target all -- -j 10
                                                                                  /usr/bin/ld: CMakeFiles/my-project.dir/src/MySourceFile.cpp.o: in function `YAML::Node::Scalar[abi:cxx11]() const':
                                                                                  /home/my-user/.conan/data/yaml-cpp/0.6.3/_/_/package/82ef5eac51c38971dea2fd342dd55ddf2ddfbbc3/include/yaml-cpp/node/impl.h:169: undefined reference to `YAML::detail::node_data::empty_scalar[abi:cxx11]()'
                                                                                  /usr/bin/ld: CMakeFiles/my-project.dir/src/MySource.cpp.o: in function `tojson::loadyaml(std::__cxx11::basic_string, std::allocator > const&)':
                                                                                  /home/my-user/my-project/lib/nlohmann/tojson.hpp:162: undefined reference to `YAML::LoadFile(std::__cxx11::basic_string, std::allocator > const&)'
                                                                                  collect2: error: ld returned 1 exit status
                                                                                  

                                                                                  Seems that the problem is that YAML::LoadFile appears to be undefined.

                                                                                  (I've tried using it without tojson also)

                                                                                  YAML::Node test = YAML::LoadFile("test.yaml");
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-May-17 at 18:59

                                                                                  The package is okay, but your profile is misconfigured.

                                                                                  undefined reference to `YAML::LoadFile(std::__cxx11::basic_string const&)' collect2: error: ld returned 1 exit status

                                                                                  You have to update your libcxx setting:

                                                                                  conan profile update settings.compiler.libcxx=libstdc++11 default
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/67575266

                                                                                  QUESTION

                                                                                  Meson - How to specify which wxgtk version to use?
                                                                                  Asked 2021-Apr-28 at 22:31

                                                                                  I'm using Arch Linux and working on a project using wxgtk3 which I installed from pacman, I also installed wxformbuilder from the AUR which pulls in wxgtk2 as a dependency. When I try to build my program, it builds fine, but when I try to run it, it throws a huge error message,

                                                                                  .
                                                                                  .
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxTreebook" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxVListBox" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxVScrolledWindow" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxHScrolledWindow" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxHVScrolledWindow" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  ./src/common/object.cpp(245): assert "classTable->Get(m_className) == NULL" failed in Register(): Class "wxXmlResourceHandler" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?
                                                                                  
                                                                                  (SampleHive:26191): Gtk-ERROR **: 05:45:13.924: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
                                                                                  zsh: trace trap  ./SampleHive
                                                                                  

                                                                                  this is only a small section of the error..

                                                                                  But if I uninstall wxgtk2 and try to run my program again, it runs fine. Is there a way to specify in meson to always use wxgtk3, so I don't have to uninstall wxgtk2 again and again, as I need wxformbuilder installed on my system.

                                                                                  EDIT:

                                                                                  This is my meson.build file,

                                                                                  project('SampleHive', 'cpp',
                                                                                    version : '0.1',
                                                                                    license : 'GPL v3',
                                                                                    default_options : ['warning_level=1',
                                                                                                       'cpp_std=c++11'])
                                                                                  
                                                                                  src = [
                                                                                  
                                                                                    'src/App.cpp',
                                                                                    'src/MainFrame.cpp',
                                                                                    'src/Browser.cpp',
                                                                                    'src/SettingsDialog.cpp',
                                                                                    'src/TagEditorDialog.cpp',
                                                                                    'src/Database.cpp',
                                                                                    'src/Serialize.cpp',
                                                                                    'src/TreeItemDialog.cpp',
                                                                                    'src/Tags.cpp',
                                                                                  
                                                                                    ]
                                                                                  
                                                                                  wx = dependency('wxwidgets', modules : ['media', 'std'])
                                                                                  wxsvg = dependency('libwxsvg')
                                                                                  taglib = dependency('taglib')
                                                                                  sqlite3 = dependency('sqlite3')
                                                                                  yaml = dependency('yaml-cpp')
                                                                                  
                                                                                  wx_inc = include_directories('/usr/include/wx-3.0')
                                                                                  
                                                                                  executable('SampleHive',
                                                                                             sources : src,
                                                                                             dependencies : [wx, wxsvg, taglib, sqlite3, yaml],
                                                                                             include_directories : wx_inc)
                                                                                  

                                                                                  to build the project I run,

                                                                                  meson build
                                                                                  ninja -C build
                                                                                  

                                                                                  And here is the link to the repository - SampleHive

                                                                                  ANSWER

                                                                                  Answered 2021-Mar-20 at 22:45

                                                                                  You can specify version for your dependency as:

                                                                                  some_dep = dependency('some_dep', version : '>=1.2.3')
                                                                                  

                                                                                  In your case, use :

                                                                                  wx = dependency('wxwidgets', modules : ['media', 'std'], version: '>=3.0.0')
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/66717115

                                                                                  QUESTION

                                                                                  Issues when installing drake in M1 macOS
                                                                                  Asked 2021-Mar-19 at 05:03

                                                                                  I follow the steps in the webpage, a problem came out when executing./setup/mac/install_prereqs.sh

                                                                                  drake % ./setup/mac/install_prereqs.sh 
                                                                                  + binary_distribution_args=()
                                                                                  + source_distribution_args=()
                                                                                  + '[' '' '!=' '' ']'
                                                                                  + source ./setup/mac/binary_distribution/install_prereqs.sh ''
                                                                                  ++ set -euxo pipefail
                                                                                  ++ with_update=1
                                                                                  ++ '[' '' '!=' '' ']'
                                                                                  ++ [[ 501 -eq 0 ]]
                                                                                  ++ command -v conda
                                                                                  ++ command -v brew
                                                                                  ++ [[ -z '' ]]
                                                                                  ++ export HOMEBREW_NO_AUTO_UPDATE=1
                                                                                  ++ HOMEBREW_NO_AUTO_UPDATE=1
                                                                                  ++ export HOMEBREW_NO_INSTALL_CLEANUP=1
                                                                                  ++ HOMEBREW_NO_INSTALL_CLEANUP=1
                                                                                  ++ binary_distribution_called_update=0
                                                                                  ++ [[ 1 -eq 1 ]]
                                                                                  ++ brew update
                                                                                  Already up-to-date.
                                                                                  ++ binary_distribution_called_update=1
                                                                                  ++ brew tap robotlocomotion/director
                                                                                  +++ cat
                                                                                  ++ brew uninstall --force robotlocomotion/director/scipy@1.5.4 robotlocomotion/director/numpy@1.19.4
                                                                                  ++ brew bundle --file=./setup/mac/binary_distribution/Brewfile --no-lock
                                                                                  Using dreal-deps/ibex
                                                                                  Using robotlocomotion/director
                                                                                  Using adoptopenjdk
                                                                                  Using clp
                                                                                  Using cmake
                                                                                  Using double-conversion
                                                                                  
                                                                                  ==> Installing ibex@2.7.4 from dreal-deps/ibex
                                                                                  ==> Downloading https://github.com/dreal-deps/ibex-lib/archive/ibex-2.7.4_10.tar.gz
                                                                                  Already downloaded: /Users/marui/Library/Caches/Homebrew/downloads/cf1b94f6783b4d23cc0bd34c10833f34cea5e7cff82ddfa24d7613f439a9d7f2--ibex-lib-ibex-2.7.4_10.tar.gz
                                                                                  ==> ./waf configure --prefix=/opt/homebrew/Cellar/ibex@2.7.4/2.7.4_10 --enable-shared --with-optim --with-solver --with-affine-extended --interval-lib=filib --lp-lib=clp --clp-path=/opt/homebrew/opt/clp
                                                                                  Last 15 lines from /Users/marui/Library/Logs/Homebrew/ibex@2.7.4/01.waf:
                                                                                  Checking for program 'make'                      : /opt/homebrew/Library/Homebrew/shims/mac/super/make 
                                                                                  Applying patch                                   : filibsrc-3.0.2.2.all.all.patch 
                                                                                  Calling configure                                : done 
                                                                                  Calling make                                     : done 
                                                                                  Calling install                                  : done 
                                                                                  Checking for header interval/interval.hpp        : yes 
                                                                                  Checking for library prim                        : yes 
                                                                                  Checking for compiler flags -frounding-math      : yes 
                                                                                  Checking for compiler flags -ffloat-store        : yes 
                                                                                  Checking for header interval/interval.hpp with -msse3 : yes 
                                                                                  Configuration of the library for LP 
                                                                                  Library for LP                                        : clp 
                                                                                  Checking for 'clp'                                    : not found 
                                                                                  The configuration failed
                                                                                  (complete log in /private/tmp/ibex-2.7.4-20210319-75719-hq0bkg/ibex-lib-ibex-2.7.4_10/__build__/config.log)
                                                                                  
                                                                                  Do not report this issue to Homebrew/brew or Homebrew/core!
                                                                                  
                                                                                  Installing dreal-deps/ibex/ibex@2.7.4 has failed!
                                                                                  Using eigen
                                                                                  Using gcc
                                                                                  Using fmt
                                                                                  Using gflags
                                                                                  Using glew
                                                                                  Using glib
                                                                                  Using graphviz
                                                                                  Using ipopt
                                                                                  Using libyaml
                                                                                  Using lz4
                                                                                  Using nlopt
                                                                                  Using numpy
                                                                                  Using openblas
                                                                                  Using pkg-config
                                                                                  Using python@3.9
                                                                                  Using scipy
                                                                                  Using spdlog
                                                                                  Using suite-sparse
                                                                                  Using tinyxml
                                                                                  Using tinyxml2
                                                                                  Using robotlocomotion/director/vtk@8.2.0
                                                                                  Using xz
                                                                                  Using yaml-cpp
                                                                                  Using zeromq
                                                                                  Homebrew Bundle failed! 1 Brewfile dependency failed to install.
                                                                                  

                                                                                  How can i fix this? Thanks in advance.

                                                                                  ANSWER

                                                                                  Answered 2021-Mar-19 at 05:03

                                                                                  The official answer: "On macOS, x86_64 is the only supported architecture and running Drake under Rosetta 2 emulation on arm64 is not supported." -- https://drake.mit.edu/developers.html#supported-configurations as of 2021-03-18.

                                                                                  You can subscribe to https://github.com/RobotLocomotion/drake/issues/14555 for any updates regarding M1 support.

                                                                                  However, if you want to try to hack through it locally, you could try commenting out homebrew dependencies that do not succeed (e.g., IBEX in this case).

                                                                                  With IBEX disabled, you'll also have to bazel build --define=NO_DREAL=ON to disable dReal for the moment. Likely, other dependencies will also fail, but we have not tested on M1 yet so we don't know how close it is to working.

                                                                                  I've filed https://github.com/dreal/homebrew-dreal/issues/10 in case we can fix the IBEX problem easily.

                                                                                  The other option would be to spin up an Ubuntu VM (based on either 18.04 or 20.04).

                                                                                  Source https://stackoverflow.com/questions/66702376

                                                                                  QUESTION

                                                                                  How to modify a value with yaml-cpp?
                                                                                  Asked 2021-Mar-03 at 11:37

                                                                                  I'm trying to make configuration file for my application, for which I'm using yaml-cpp library to generate a configuration and modify when user changes changes some setting or something in the application. I have a separate class set up for this, the constructor generates the yaml file which looks like this,

                                                                                  Serializer::Serializer(const std::string& filepath)
                                                                                  {
                                                                                      std::ifstream ifin(filepath);
                                                                                  
                                                                                      if (!ifin)
                                                                                      {
                                                                                          emitter << YAML::Comment("Hello");
                                                                                          emitter << YAML::BeginDoc;
                                                                                          emitter << "This is the configuration file for the Sample Browser,"
                                                                                                  << YAML::Newline;
                                                                                          emitter << "feel free to edit this file as needed";
                                                                                          emitter << YAML::EndDoc;
                                                                                  
                                                                                          emitter << YAML::BeginMap;
                                                                                  
                                                                                          emitter << YAML::Newline << YAML::Key << "Window";
                                                                                          emitter << YAML::BeginMap;
                                                                                          emitter << YAML::Key << "SizeW" << YAML::Value << "1280";
                                                                                          emitter << YAML::Key << "SizeH" << YAML::Value << "720";
                                                                                          emitter << YAML::EndMap << YAML::Newline;
                                                                                  
                                                                                          emitter << YAML::Newline << YAML::Key << "Media";
                                                                                          emitter << YAML::BeginMap;
                                                                                          emitter << YAML::Key << "Autoplay" << YAML::Value << "false";
                                                                                          emitter << YAML::Key << "Loop" << YAML::Value << "false";
                                                                                          emitter << YAML::Key << "Muted" << YAML::Value << "false";
                                                                                          emitter << YAML::EndMap << YAML::Newline;
                                                                                  
                                                                                          emitter << YAML::Newline << YAML::Key << "Display";
                                                                                          emitter << YAML::BeginMap;
                                                                                          emitter << YAML::Key << "Font";
                                                                                          emitter << YAML::BeginMap;
                                                                                          emitter << YAML::Key << "Family" << YAML::Value << "Sans";
                                                                                          emitter << YAML::Key << "Size" << YAML::Value << "10";
                                                                                          emitter << YAML::EndMap;
                                                                                          emitter << YAML::EndMap << YAML::Newline;
                                                                                  
                                                                                          emitter << YAML::Newline << YAML::Key << "Import_dir";
                                                                                          emitter << YAML::BeginMap;
                                                                                          emitter << YAML::Key << "AutoImport" << YAML::Value << "false";
                                                                                          emitter << YAML::Key << "Directory" << YAML::Value << "/home/apoorv";
                                                                                          emitter << YAML::EndMap << YAML::Newline;
                                                                                  
                                                                                          emitter << YAML::EndMap;
                                                                                  
                                                                                          std::ofstream ofout(filepath);
                                                                                          ofout << emitter.c_str();
                                                                                      }
                                                                                      else
                                                                                      {
                                                                                          wxLogDebug("Config file already exists! Skipping..");
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  and the output of this file looks like,

                                                                                  # Hello
                                                                                  ---
                                                                                  This is the configuration file for the Sample Browser,
                                                                                  feel free to edit this file as needed
                                                                                  ...
                                                                                  
                                                                                  Window:
                                                                                    SizeW: 1280
                                                                                    SizeH: 720
                                                                                  
                                                                                  Media:
                                                                                    Autoplay: false
                                                                                    Loop: false
                                                                                    Muted: false
                                                                                  
                                                                                  Display:
                                                                                    Font:
                                                                                      Family: "Sans"
                                                                                      Size: "10"
                                                                                  
                                                                                  Import_dir:
                                                                                    AutoImport: false
                                                                                    Directory: "/home/apoorv/"
                                                                                  

                                                                                  I want that when user changes say font, the related key value also changes with the selected option. I tried making a function that should do this like,

                                                                                  void Serializer::SerializeDisplaySettings(const std::string& filepath, wxFont& font)
                                                                                  {
                                                                                      YAML::Emitter out;
                                                                                  
                                                                                      std::string fontFace = font.GetFaceName().ToStdString();
                                                                                      int fontSize = font.GetPointSize();
                                                                                  
                                                                                      std::ifstream ifin(filepath);
                                                                                  
                                                                                      try
                                                                                      {
                                                                                          YAML::Node config = YAML::LoadAllFromFile(filepath)[1];
                                                                                  
                                                                                          auto display = config["Display"];
                                                                                  
                                                                                          if (auto fontSetting = display["Font"])
                                                                                          {
                                                                                              wxLogDebug("Changing font settings");
                                                                                              wxLogDebug("Font face: %s", fontFace);
                                                                                              wxLogDebug("Font size: %d", fontSize);
                                                                                  
                                                                                              out << YAML::Key << fontSetting["Family"] << YAML::Value << fontFace;
                                                                                              out << YAML::Key << fontSetting["Size"] << YAML::Value << fontSize;
                                                                                  
                                                                                              std::ofstream ofout(filepath);
                                                                                              ofout << out.c_str();
                                                                                          }
                                                                                          else
                                                                                          {
                                                                                              wxLogDebug("Error! Cannot fetch values.");
                                                                                          }
                                                                                      }
                                                                                  
                                                                                      catch(const YAML::ParserException& ex)
                                                                                      {
                                                                                          std::cout << ex.what() << std::endl;
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  but this deletes the whole and fills just font name and size. How do I modify those values without changing/deleting whole file?

                                                                                  ANSWER

                                                                                  Answered 2021-Mar-03 at 11:37

                                                                                  You override the file, of course it only contains the items you gave to the emitter out. If you want to modify the loaded file, you should update the values in config and write all of it back out:

                                                                                  fontSetting["Family"] = fontFace;
                                                                                  fontSetting["Size"] = fontSize;
                                                                                  out << config;
                                                                                  std::ofstream ofout(filepath);
                                                                                  ofout << out.c_str();
                                                                                  

                                                                                  To get the other content as well, do this when loading:

                                                                                  auto docs = YAML::LoadAllFromFile(filepath);
                                                                                  out << YAML::Comment("Hello") << YAML::BeginDoc << docs[0] << YAML::EndDoc;
                                                                                  YAMl::Node config = docs[1];
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/66451365

                                                                                  QUESTION

                                                                                  How to create the top object with yaml-cpp?
                                                                                  Asked 2021-Jan-31 at 09:19

                                                                                  I am trying to create a config file for my application using yaml-cpp, I am able to create map by

                                                                                      YAML::Emitter emitter;
                                                                                      emitter << YAML::BeginMap;
                                                                                      emitter << YAML::Key << "Autoplay" << YAML::Value << "false";
                                                                                      emitter << YAML::EndMap;
                                                                                  
                                                                                      std::ofstream ofout(file);
                                                                                      ofout << emitter.c_str();
                                                                                  

                                                                                  which outputs something like,

                                                                                  var1: value1
                                                                                  var2: value2
                                                                                  

                                                                                  But how would I make the top object like,

                                                                                  Foo:
                                                                                    var1: value1
                                                                                    var2: value2
                                                                                  
                                                                                  Bar:
                                                                                    var3: value3
                                                                                    var4: value4
                                                                                  

                                                                                  and so on.. How do I get the Foo and the Bar like in the above code.

                                                                                  ANSWER

                                                                                  Answered 2021-Jan-31 at 09:19

                                                                                  What you want to achieve is a map containing two keys Foo and Bar. Each of these containing a map as a value. The code below show you how you can achieve that:

                                                                                  // gcc -o example example.cpp -lyaml-cpp
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  int main() {
                                                                                    std::string file{"example.yaml"};
                                                                                  
                                                                                    YAML::Emitter emitter;
                                                                                    emitter << YAML::BeginMap;
                                                                                  
                                                                                    emitter << YAML::Key << "Foo" << YAML::Value;
                                                                                    emitter << YAML::BeginMap; // this map is the value associated with the key "Foo"
                                                                                    emitter << YAML::Key << "var1" << YAML::Value << "value1";
                                                                                    emitter << YAML::Key << "var2" << YAML::Value << "value2";
                                                                                    emitter << YAML::EndMap;
                                                                                  
                                                                                    emitter << YAML::Key << "Bar" << YAML::Value;
                                                                                    emitter << YAML::BeginMap; // This map is the value associated with the key "Bar"
                                                                                    emitter << YAML::Key << "var3" << YAML::Value << "value3";
                                                                                    emitter << YAML::Key << "var4" << YAML::Value << "value4";
                                                                                    emitter << YAML::EndMap;
                                                                                  
                                                                                    emitter << YAML::EndMap; // This ends the map containing the keys "Foo" and "Bar"
                                                                                  
                                                                                    std::ofstream ofout(file);
                                                                                    ofout << emitter.c_str();
                                                                                    return 0;
                                                                                  }
                                                                                  

                                                                                  You have to see these sorts of structures with a recursive mindset. This code will create the example you gave.

                                                                                  Source https://stackoverflow.com/questions/65976778

                                                                                  QUESTION

                                                                                  Yaml_cpp in debug with visual studio 2019 and cmake
                                                                                  Asked 2021-Jan-26 at 07:51

                                                                                  I'm trying to understand how to use my linux project on windows with visual studio 2019. So I write a simple test for yaml_cpp :

                                                                                  #include "yaml-cpp/yaml.h"
                                                                                  
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  int main() 
                                                                                  {
                                                                                      try 
                                                                                      {
                                                                                          assert(1 == 2);
                                                                                          YAML::Node config = YAML::LoadFile("config.yaml");
                                                                                          std::cerr << config["hello"].as() << std::endl;
                                                                                  
                                                                                          
                                                                                      }
                                                                                      catch (std::exception& e)
                                                                                      {
                                                                                          std::cerr << "Caught " << e.what() << std::endl;
                                                                                          std::cerr << "Type " << typeid(e).name() << std::endl;
                                                                                      };
                                                                                  
                                                                                      return 0;
                                                                                  }
                                                                                  

                                                                                  and I write a basic CMakeLists.txt file :

                                                                                  cmake_minimum_required(VERSION 3.1)
                                                                                  
                                                                                  project (test)
                                                                                  
                                                                                  set(CMAKE_CONFIGURATION_TYPES "Debug;Release" CACHE STRING "" FORCE) 
                                                                                  
                                                                                  get_filename_component(PARENT_DIR_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} DIRECTORY)
                                                                                  
                                                                                  find_package(yaml-cpp REQUIRED PATHS "${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/share/cmake/yaml-cpp")
                                                                                  
                                                                                  add_executable(test
                                                                                    main.cpp)
                                                                                    
                                                                                    target_include_directories(test
                                                                                    PUBLIC
                                                                                    ${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/include >
                                                                                    )
                                                                                  
                                                                                  target_link_libraries(test debug yaml-cppd optimized yaml-cpp)
                                                                                  

                                                                                  I generate the project with cmake -G "Visual Studio 16 2019" -Ax64 ... The program compiles and works well on Release (cmake --build . --config Release). But in Debug (cmake --build . --config Debug, I have the following error :

                                                                                  LINK : fatal error LNK1104: impossible d'ouvrir le fichier 'yaml-cppd.lib' [C:\Users\kafka\dev\C++\test\yaml_for_vs\bui
                                                                                  ld\test.vcxproj]
                                                                                  

                                                                                  "Impossible d'ouvrir le fichier" means the file 'yaml-cppd.lib' can't be open. I have compile yaml-cpp in release and debug and the file 'yaml-cppd.lib' is present in "C:\Program Files (x86)\YAML_CPP\lib". What am I missing ?

                                                                                  ANSWER

                                                                                  Answered 2021-Jan-26 at 07:51

                                                                                  It's definitely wierd that release file is found while debug is not. You should look at Visual Studio's test properties page (under "Editeur de liens", check "Dependances supplémentaires" in "entrée", and "Répertoire de bibliothèques supplémentaires" in "Général", then switch between "Debug" and "Release" config and see what's different).

                                                                                  Anyway, here are two workarounds that may fix your issue:

                                                                                  Explicitely specify where libraries should be picked-up from:

                                                                                  link_directories( "${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/lib" )
                                                                                  

                                                                                  Or, explictely specify .lib file to be linked:

                                                                                  target_link_libraries(test debug ${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/lib/yaml-cppd.lib optimized ${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/lib/yaml-cpp.lib)
                                                                                  

                                                                                  This last one has the disadvantage of not being cross-platform (under Linux, it should be replaced by target_link_libraries(test debug ${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/lib/libyaml-cppd.so optimized ${PARENT_DIR_INSTALL_PREFIX}/YAML_CPP/lib/libyaml-cpp.so). But it may be an acceptable workaround if the first one does not fix your issue.

                                                                                  Source https://stackoverflow.com/questions/65798917

                                                                                  QUESTION

                                                                                  undefined reference to : what's wrong?
                                                                                  Asked 2021-Jan-19 at 15:14

                                                                                  Im' trying to port a home made software from AIX to "Red Hat Enterprise Linux 7.8"

                                                                                  I'm facing "undefined reference to" errors at link time and, for now, I can't find where I screwed up.

                                                                                  The goal is to generate an executable from 2 homemade shared librairies (msi and atmi), some object previously compiled (MsiServices.o) and a C program (pingsrv.c). Below is the command :

                                                                                  gcc -DWall -o bin/pingsrv -DUNIX -I. -g -DUNIX -D_THREAD_SAFE -D_LARGEFILE64_SOURCE -I/home/vgi/git/msi-tools/ping/server/target/msi/include/yaml-cpp -I/home/vgi/git/msi-tools/ping/server/target/msi/include/apr-1 -I/home/vgi/git/msi-tools/ping/server/target/msi/include/activemq-cpp-3.9.4 -I/home/vgi/git/msi-tools/ping/server/target/msi/include /tmp/MsiServices.o ./pingsrv.c -L/home/vgi/git/msi-tools/ping/server/target/msi/lib -lmsi -lactivemq-cpp -llog4cxx -latmi -lapr-1 -laprutil-1 -lexpat -lstdc++ -lyaml-cpp
                                                                                  

                                                                                  Errors appears a link time:

                                                                                  /home/vgi/git/msi-tools/ping/server/target/msi/lib/libatmi.so: undefined reference to `Msi_tpreturn'
                                                                                  /home/vgi/git/msi-tools/ping/server/target/msi/lib/libatmi.so: undefined reference to `Msi_tpcall'
                                                                                  /home/vgi/git/msi-tools/ping/server/target/msi/lib/libmsi.so: undefined reference to `msi::service::optarg'
                                                                                  /home/vgi/git/msi-tools/ping/server/target/msi/lib/libatmi.so: undefined reference to `Msi_userlog'
                                                                                  

                                                                                  Library atmi is written in C and is able to call some C++ instance methods by using wrappers:

                                                                                  ...
                                                                                  typedef struct MsiScheduler MsiScheduler ;
                                                                                  extern void Msi_tpreturn(MsiScheduler *,int, long , char *, long, long);
                                                                                  extern void Msi_userlog(MsiScheduler *,char*) ;
                                                                                  extern int Msi_tpcall(MsiScheduler *,char *svc, char *idata, long ilen, char **odata, long *olen, long flags) ;
                                                                                  ...
                                                                                  extern void tpreturn(int rval, long rcode, char * data, long len, long flags)
                                                                                  {
                                                                                      assert(vg_Consumer != NULL) ;
                                                                                      Msi_tpreturn(vg_Consumer,rval,rcode,data,len,flags) ;
                                                                                  

                                                                                  }

                                                                                  Wrappers called by this library are defined in another library called msi. Wrappers are defined in a C++ source file (MsiScheduler.cpp):

                                                                                  void Msi_tpreturn(MsiScheduler * c,int ret,long code,char *data,long len,long flags)
                                                                                  {
                                                                                      TypedBuffer* buffer = NULL ;
                                                                                  
                                                                                      if (data != NULL)
                                                                                      {
                                                                                         buffer = TypedBuffer::createBuffer(getType(data),data,len) ; 
                                                                                      }
                                                                                      MsiReply * reply = MsiReply::createReply(ret,code,buffer) ;
                                                                                  
                                                                                      c->tpreturn(reply) ;
                                                                                  
                                                                                      if (data != NULL)
                                                                                      {
                                                                                         freebuf(data) ;
                                                                                      }
                                                                                      delete reply ;
                                                                                  }
                                                                                  int Msi_tpcall(MsiScheduler * c,char *svc, char *idata, long ilen, char **odata, long *olen, long flags)
                                                                                  {
                                                                                       ...
                                                                                  }
                                                                                  void Msi_userlog(MsiScheduler *c ,char* str)
                                                                                  {
                                                                                      c->userlog(str) ;
                                                                                  }
                                                                                  

                                                                                  header file (MsiScheduler.h) contains this fragment :

                                                                                  #ifdef __cplusplus
                                                                                  extern "C" {
                                                                                  #endif
                                                                                  
                                                                                  #if defined(__STDC__) || defined(__cplusplus)
                                                                                  extern void Msi_tpreturn(MsiScheduler *,int, long , char *, long, long);
                                                                                  extern void Msi_userlog(MsiScheduler *,char*) ;
                                                                                  extern int Msi_tpcall(MsiScheduler *,char *svc, char *idata, long ilen, char **odata, long *olen, long flags) ;
                                                                                  #else
                                                                                  extern void Msi_tpreturn();
                                                                                  extern void Msi_userlog() ;
                                                                                  extern int Msi_tpcall() ;
                                                                                  #endif
                                                                                  
                                                                                  #ifdef __cplusplus
                                                                                  }
                                                                                  #endif
                                                                                  

                                                                                  Librairies are constructed like that:

                                                                                  g++ -g -fPIC -Wall -I/home/vgi/git/msi/msi-service/target/ext/include/apr-1 -I/home/vgi/git/msi/msi-service/target/ext/include/activemq-cpp-3.9.4 -I/home/vgi/git/msi/msi-service/target/ext/include/yaml-cpp -I/home/vgi/git/msi/msi-service/target/ext/include -I/home/vgi/git/msi/msi-service/target/ext/include -I../lib/inc -I./ -o MsiScheduler.o -c MsiScheduler.cpp
                                                                                  ...
                                                                                  g++ -shared MsiUtil.o MsiConfig.o MsiInstrumentation.o MsiMetric.o MsiService.o MsiExceptions.o MsiCharsetConverter.o MsiTypes.o MsiMessage.o MsiMessageUtil.o MsiScheduler.o MsiServer.o -o libmsi.so
                                                                                  ...
                                                                                  gcc -g -fPIC -Wall -I/home/vgi/git/msi/msi-service/target/ext/include/apr-1 -I/home/vgi/git/msi/msi-service/target/ext/include/activemq-cpp-3.9.4 -I/home/vgi/git/msi/msi-service/target/ext/include/yaml-cpp -I/home/vgi/git/msi/msi-service/target/ext/include -I/home/vgi/git/msi/msi-service/target/ext/include -I../lib/inc -I./ -o atmi.o -c atmi.c
                                                                                  gcc -shared atmi.o memmngt.o -o libatmi.so
                                                                                  

                                                                                  FYI, everything compile and link well on AIX OS (with xlc,xlC commands).

                                                                                  I also tried to change librairies order for linking command, without success.

                                                                                  I guess there is something specific to linux/gcc but I haven't found it yet.

                                                                                  ANSWER

                                                                                  Answered 2021-Jan-19 at 14:15

                                                                                  When you're compiling pingsrv.c you try to link msi with -l. Have you put libmsi.so in the library path so that -l can find it?

                                                                                  Source https://stackoverflow.com/questions/65793107

                                                                                  QUESTION

                                                                                  How to build a node with yaml-cpp?
                                                                                  Asked 2020-Nov-17 at 18:37

                                                                                  I want to use yaml-cpp for a project of mine to generate a yaml-file however I have trouble figuring out how exactly I have to go about this. The yaml file I need to emit should look like this:

                                                                                  action_counts:
                                                                                    version: 0.3
                                                                                    subtree:
                                                                                      - name: system
                                                                                        local:
                                                                                        - name: adder
                                                                                          action_counts:
                                                                                            - name: add
                                                                                              counts: 1000
                                                                                            - name: idle
                                                                                              counts: 10000
                                                                                  

                                                                                  So far I haven't been able to write the last four lines. I know that a '-' represents an array but I don't know how I can print the name and counts keys like that.

                                                                                  I have written some bits of code to experiment with yaml-cpp. The code looked like this:

                                                                                      YAML::Node node;
                                                                                  
                                                                                      node["action_counts"] = YAML::Null;
                                                                                      node["action_counts"]["version"] = "0.3";
                                                                                  
                                                                                      node["action_counts"]["subtree"].push_back("system");
                                                                                  
                                                                                      std::ofstream fout("fileUpdate.yaml"); 
                                                                                      fout << node; 
                                                                                  
                                                                                      return 0;
                                                                                  

                                                                                  And the output it produces is this:

                                                                                  action_counts:
                                                                                    version: 0.3
                                                                                    subtree:
                                                                                      - system
                                                                                  

                                                                                  The last line here is wrong but I haven't managed to find out how to print - name: system instead of this. How do I do this?

                                                                                  Once thats done how do I print the rest? Is local a part of the - name array? I think once I know how to format those to two lines I can figure out the rest by myself.

                                                                                  ANSWER

                                                                                  Answered 2020-Nov-17 at 10:53

                                                                                  The value in the array is just another mapping with the keys name and local, so you need to put that mapping into the array, e.g.:

                                                                                  YAML::Node systemTree;
                                                                                  
                                                                                  systemTree["name"] = "system";
                                                                                  /* assuming you have put together adderTree similarly */
                                                                                  systemTree["local"].push_back(adderTree);
                                                                                  
                                                                                  YAML::Node root;
                                                                                  
                                                                                  root["action_counts"] = YAML::Null;
                                                                                  root["action_counts"]["version"] = "0.3";
                                                                                  
                                                                                  root["action_counts"]["subtree"].push_back(systemTree);
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/64867572

                                                                                  QUESTION

                                                                                  Editing a QVariantMap from QML
                                                                                  Asked 2020-Nov-17 at 17:53

                                                                                  I have a QVariantMap created in C++ from a JSON object and I want to update this object from QML. I set it as a context property.

                                                                                  // main.cpp
                                                                                  engine.rootContext()->setContextProperty("myjson", myqvariantmap);
                                                                                  

                                                                                  In QML I tried updating its properties but it seems to be read-only. The docs support this, saying

                                                                                  Mind that QVariantList and QVariantMap properties of C++ types are stored as values and cannot be changed in place by QML code. You can only replace the whole map or list, but not manipulate its contents.

                                                                                  Is there a workaround or an alternative type I can use in place of QVariatnMap?

                                                                                  ANSWER

                                                                                  Answered 2020-Nov-17 at 16:54

                                                                                  One possible option is QQmlPropertyMap:

                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  int main(int argc, char *argv[])
                                                                                  {
                                                                                      QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
                                                                                  
                                                                                      QGuiApplication app(argc, argv);
                                                                                  
                                                                                      QQmlPropertyMap qpropertymap;
                                                                                      qpropertymap.insert("name", "foo");
                                                                                  
                                                                                      QObject::connect(&qpropertymap, &QQmlPropertyMap::valueChanged, [](const QString &key, const QVariant &value){
                                                                                          qDebug() << key << value;
                                                                                      });
                                                                                  
                                                                                      QQmlApplicationEngine engine;
                                                                                      engine.rootContext()->setContextProperty("qpropertymap", &qpropertymap);
                                                                                      const QUrl url(QStringLiteral("qrc:/main.qml"));
                                                                                      QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                                                                                                       &app, [url](QObject *obj, const QUrl &objUrl) {
                                                                                          if (!obj && url == objUrl)
                                                                                              QCoreApplication::exit(-1);
                                                                                      }, Qt::QueuedConnection);
                                                                                      engine.load(url);
                                                                                  
                                                                                      return app.exec();
                                                                                  }
                                                                                  
                                                                                  import QtQuick 2.12
                                                                                  import QtQuick.Window 2.12
                                                                                  
                                                                                  Window {
                                                                                      width: 640
                                                                                      height: 480
                                                                                      visible: true
                                                                                      title: qsTr("Hello World")
                                                                                      Component.onCompleted: {
                                                                                          qpropertymap.name = "bar"
                                                                                          // or
                                                                                          // qpropertymap["name"] = "bar"
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/64879496

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                                                                                  Vulnerabilities

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                                                                                  Install ml-cpp

                                                                                  To get started with Machine Learning please have a look at https://www.elastic.co/guide/en/machine-learning/current/ml-getting-started.html. Full documentation of Machine Learning can be found at https://www.elastic.co/guide/en/machine-learning/current/index.html.
                                                                                  You don't need to specifically build the C++ components for machine learning as, by default, the elasticsearch build will download pre-compiled C++ artifacts. Setting up a build environment for ml-cpp native code is complex. If you are specifically interested in working with the ml-cpp code, then information regarding setting up a build environment can be found in the build-setup directory. To use CLion with the project, please refer to the "Using CLion" tutorial.

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