CODEWITHSUNDEEP
c++visual-studiointellisensec++20
Hugo
Hugo

Reputation: 187

VS 2022. Why my Intellisence does not work when using C++ 20 modules?

I would like to use the C++ 20 Modules in VS 2022. Unfortunately, I cannot use intellisence, even on a very simple test. I put options as "C++ latest", "Modules", Advanced>>"Compile as C++ module code". Unfortunately, there are squiggles at the file beginning, and no intellisence, and no identifiers highlighting. Also, we cannot import std; anymore (nor std.core).

//Test of modules.
#define MODULES
#ifdef MODULES
    import module1;
#else
    #include <iostream>
    #include <vector>
    #include <format>
#endif

std::vector<std::string> vec{"Some", " sentence", " to", " print !"};

int main()
{
    std::cout << std::format("Hello World!\n");
    for (auto & str : vec) {
        std::cout << std::format("{}", str);
    }
return 0;
}

The file module1.ixx:

export module module1;

export import <iostream>;
export import <format>;
export import <string>;
export import <vector>;
export import <deque>;
export import <chrono>;

Can someone tell me what I am missing ? VS and intellisence work perfectly with the #include without any problem.

Upvotes: 3

Views: 2161

Answers (1)

pascal754
pascal754

Reputation: 189

Intellisence module support is still experimental.

I tested your code in Visual Studio 2022 Version 17.4.3 and there was no issues.

However, Visual Studio 2022 Version 17.5.0 Preview 2.0 shows a couple of squiggles.

ISO committee(C++23) voted for import std; and import std.compat;.

To use import std; in preview version(17.5.0) you need to add std.ixx file. In my machine, the file is located in C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\modules.

Add the file from Solution Explorer(Add -> existing Item...).

Please, refer to this site for more information. https://learn.microsoft.com/en-us/cpp/cpp/tutorial-import-stl-named-module?view=msvc-170

EDIT: As of MSVC 17.6.0 Preview 3.0, it is not necessary to add std.ixx file. The IDE knows how to build. If added it causes compile error.

Upvotes: 3

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