c++ - Import std lib as modules with clang

Question

I am experimenting with modules in clang, and would like to include the standard lib as modules instead of as includes.

Currently I do this

#include <iostream>
#include <string>

It seems that you in msvc should be able to import standard libs with for example

import std.core;

When using clang however this does not seem to be implemented, or implemented in another way.

My question is: Is it possible to import stl-includes like microsoft suggest, or is it possible to map standard lib includes to modules somhow.

Note: The reason I cannot use #include <...> or #import <...> is because of other errors that might get its own question. So I think that getting import std.core or similar is the way to go now if it is possible.

ModernesCpp also mentions std.core.

Answer 1

The C++20 standard does not include module definitions for the C++ standard library. Visual Studio does (unfortunately), and a lot of bad sites out there will act like this is standard. But it's not; it's just a Microsoft thing.

If you want to include the C++ standard library through a module across platforms, you will have to either use import <header-name> syntax or write your own standard library modules that import the headers and export specific C++ declarations.