Re: Interest for C++20 modules support of boost officially

From: Peter Dimov (pdimov_at_[hidden])
Date: 2025-01-13 19:37:50

Ruben Perez wrote:
> I think this applies for non module units, too. I've just tested that,
> under MSVC, the following errors:
> 
> // File: main.cpp
> import std;
> #include <cstddef>
> int main() {}
> 
> This does not seem to happen with all the headers, though.
> * version, cstdint, climits, cassert, cfloat, cstdio, cstdlib, cerrno
> seem to work fine
> * cmath and cstddef seem to error.
> 
> So if we have in a program:
> 
> // File: main.cpp
> #include <boost/mp11.hpp>
> #include <boost/charconv.hpp>
> int main() {}

Yeah, that's going to be a problem.

Interestingly, though,

import std;
#include <math.h>
#include <stddef.h>
int main() {}

works fine.

If we only need these for the macros, this might well work.

(It's probably std::byte from cstddef that breaks things.)