learn_cpp | c入门学习（cprimer 5th）

by LiuChuang0059 C++ Version: Current License: No License

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kandi X-RAY | learn_cpp Summary

learn_cpp is a C++ library. learn_cpp has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

c++入门学习（c++primer 5th）

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learn_cpp has a low active ecosystem.

It has 6 star(s) with 1 fork(s). There are no watchers for this library.

It had no major release in the last 6 months.

learn_cpp has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of learn_cpp is current.

Quality

learn_cpp has no bugs reported.

Security

learn_cpp has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

learn_cpp does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

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learn_cpp releases are not available. You will need to build from source code and install.

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learn_cpp Key Features

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learn_cpp Examples and Code Snippets

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Community Discussions

Trending Discussions on learn_cpp

C++ Unable to assign base class "this" pointer the derived class object inside base class constructor

Problems with std::cin.fail()

CMake cannot find header file near the source one

Graphviz Sparse Matrix Node Aligment

How do I link C++ MySQL Connector Libraries to Cmake?

QUESTION

C++ Unable to assign base class "this" pointer the derived class object inside base class constructor

Asked 2021-Mar-29 at 18:51

Hi I am learning C++ and was trying to construct something where base class *this pointer is assigned the derived class object using the following construction. My question is that, is it possible in C++ in this way? Because, when i try to compile it, i get the error

error: expected type-specifier before ‘Derived_1’

If something like this is possible, then what is the correct way to do that. My objective to do this is to automatically get the relative derived class implementation through base class, based on the DISPLAY Type, to avoid if-else kind of clauses in main. Any help will be much appreciated.

...

ANSWER

Answered 2021-Mar-29 at 18:51

You absolutely can't do what you're doing. You can't do this:

Source https://stackoverflow.com/questions/66857531

QUESTION

Problems with std::cin.fail()

Asked 2020-Jul-11 at 19:39

I am writing some code to read from the terminal with cpp but for some reason it crashed after running out of numbers. From what I have read online I should be able to check if std::cin was successful by using std::cin.fail() but it crashes before.

The code I am running is

...

ANSWER

Answered 2020-Jul-11 at 19:39

Nothing in your input causes cin to set the fail bit. Hence, the while (true) will just keep going. You can enter a letter, or something which is otherwise not an int, which will set the fail bit, and cause the loop to break.

Note that a new line will be ignored for this purpose.

If you know that all your input will be on a single line, then you can use std::getline to read in the entire line, and then std::stringstream to read the integers from that line.

Source https://stackoverflow.com/questions/62852882

QUESTION

CMake cannot find header file near the source one

Asked 2019-Dec-05 at 07:52

I don't want to install sqlite globally in my system, so I have downloaded the sqlite3 files from https://www.sqlite.org/2018/sqlite-amalgamation-3240000.zip and have copied sqlite3.c and sqlite3.h into the project folder.

CMakeLists.txt:

...

ANSWER

Answered 2018-Jun-27 at 08:06

By default, CMake doesn't search headers files in the current directory. For enable this behaviour, set CMAKE_INCLUDE_CURRENT_DIR variable:

Source https://stackoverflow.com/questions/51055601

QUESTION

Graphviz Sparse Matrix Node Aligment

Asked 2018-Mar-18 at 08:55

i am trying to graph a sparse matrix with dot language, in fact the node connections are ok, but the problem is the vertical alignment of these nodes, i have tried to use pos and place nodes with x and y values, but just doesn't work (I think because of the default layout). If you can help me a stressed student will thank you. My dot code is bellow and a link of the image generated.

https://github.com/Gualtix/Learn_CPP/blob/master/Matrix.png

Thank you.

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ANSWER

Answered 2018-Mar-18 at 08:55

The most important tool to get closer to the sparse matrix you want is group:

group

If the end points of an edge belong to the same group, i.e., have the same group attribute, parameters are set to avoid crossings and keep the edges straight.

As your sparse matrix is very sparse, I needed some empty nodes as well. I have also removed [constraint = true] as it is the default anyway. The changes I made are as comments in the source code:

Source https://stackoverflow.com/questions/49343366

QUESTION

How do I link C++ MySQL Connector Libraries to Cmake?

Asked 2018-Jan-09 at 11:32

I am using CLion to make a C++ program that uses a MySQL database to handle data. I have downloaded the MySQL Connector and Boost and linked it to my cmake file. However, when I tried to build my project, an error appeared saying "undefined reference to `_imp__get_driver_instance'". Someone told me to link the MySQL Connector libraries, but since I am quite new to C++ and to using this connector, I have no idea on how to do this.

At the moment, this is my Cmake file:

...

ANSWER

Answered 2018-Jan-09 at 11:32

The MySql docs describe this extensively for Visual Studio and Netbeans. You need to do the respective thing for CMake.

The quick and dirty way is to just hardcode the path to the library in your CMakeLists.txt:

Source https://stackoverflow.com/questions/48165654

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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