Re: We have a new standard!

On Thu, 2 Jan 2025 13:51:53 +0100
David Brown <david.brown@hesbynett.no> wrote:

 
Could this all have been done from the start of C++?  In theory, yes
- in practice no.  std::format and std::print rely on various modern
C++ features, such as compile-time evaluation of functions,

It does not look like dependence of std::format on compile-time
evaluation is a requirement of standard rather than implementation
choice of g++ and of clang++.

MSVC 19.30.30706 compiles the following code just fine:

#include <cstdio>
#include <format>

int main(int argc, char** argv)
{
  if (argc >= 3) {
    std::string s = std::format(argv[1], argv[2]);
    printf("%s\n", s.c_str());
  }
  return 0;
}

When run, it produces expected results.

Or, may be, it's because this version of MSVC is not fully C++20
complient.