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  Ravi kumar December 14, 2020 0

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  Hey friends, i wan’t to start developing desktop applications using visual studio, what do i need to learn for that, what steps to follow and what libraries to learn. Can u help me how to start using visual studio for that.

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  Noel Grandin November 25, 2020 0

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  The LibreOffice team would like to vote for std::source_location 🙂

  https://en.cppreference.com/w/cpp/utility/source_location

  We’re using it to add source information to exception throwing, which makes debugging much more pleasant

  • 

    Daniel Griffing Author December 2, 2020 0

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    Thank you Noel!

    Support for std::source_location is on the short list of remaining C++20 features and I know that work is being done targeting a future VS release. You can follow progress of C++20 STL features here: https://github.com/microsoft/STL/projects/3.

    From the language/compiler perspective, I know that work is currently in progress that will enable the completion of this feature.

    Regards,
    –Daniel

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  屿 罗 November 22, 2020 0

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  import STL headers doesn’t work with /experimental:module and /std:c++latest

  export module Print;
  import string; 
  import stdio.h; 
  namespace Print
  {
  	export void PrintLine(std::string msg)
  	{
  		printf("%s\n", msg.c_str());
  	}
  }
  

  • 

    Bogdan Mazurenko November 28, 2020 0

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    https://docs.microsoft.com/en-us/cpp/cpp/modules-cpp?view=msvc-160&viewFallbackFrom=vs-2019#consume-the-c-standard-library-as-modules

    • 

      Daniel Griffing Author December 2, 2020 0

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      Bogdan: Thank you for providing the link to docs on this topic!

  • 

    Cameron DaCamara November 23, 2020 0

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    Hi,

    One thing to note about the header import syntax is that you need to write the header-name as if it was the argument to an `#include` directive:

    <code>

    The story around the STL headers being importable is being tracked by GH-60. Other header units for your project may be created and imported through the IDE experience documented here: https://devblogs.microsoft.com/cppblog/standard-c20-modules-support-with-msvc-in-visual-studio-2019-version-16-8/#project-system.

    Please let me know if you have any additional questions.

    Read more

    Hi,

    One thing to note about the header import syntax is that you need to write the header-name as if it was the argument to an `#include` directive:

    import <string>;
    import <cstdio>;

    The story around the STL headers being importable is being tracked by GH-60. Other header units for your project may be created and imported through the IDE experience documented here: https://devblogs.microsoft.com/cppblog/standard-c20-modules-support-with-msvc-in-visual-studio-2019-version-16-8/#project-system.

    Please let me know if you have any additional questions.

    Read less
• 

  Alex Syniakov November 20, 2020 0

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  Tried to modularize my pet project – got a lot of “compiler internal error”(s). All errors occur around “global module fragment”

  • 

    Cameron DaCamara November 23, 2020 0

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    Hi Alex,

    Can I ask you to file a bug on DevComm? We are working hard to improve the compiler as soon as we find issues.

    • 

      Alex Syniakov December 1, 2020 0

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      https://developercommunity.visualstudio.com/content/problem/1270518/modules-and-chaiscript-internal-compiler-error.html

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  James Wil November 20, 2020 0

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  Modules doesn’t work, i tried both the latest version of VS and the Preview

  error C3674: could not find standard library module 'std'

  and import std; shows in red

  export module Module;
  
  import std;
  
  export int main() {
      return 0;
  }

  I have enabled modules and latest c++ version on the project settings

  What else should i do?

  • 

    Stanislav Ershov November 21, 2020 0

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    From the previous blog post

    The std.* Modules which ship with Visual Studio will not be available through /std:c++latest alone. The standard library Modules have not yet been standardized and as such remain experimental. To continue using the standard library Modules users will need /experimental:module as part of their command line options.

    • 

      Daniel Griffing Author December 2, 2020 0

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      Thank you for the reply Stanislav!

      That is correct. ISO C++ has not yet standardized how the standard library will be organized with Modules. This is something that is being worked on for a future standard revision (hopefully C++23).