The <charconv> header from C++17's standard library.

Collaboration diagram for charconv:

The <charconv> header from C++17's standard library.

The following table describes what implementation of std::to_chars and std::from_chars will be used

stdlib version	__cpp_lib_to_chars	chars_format	to_chars_result	from_chars_result	to_chars (int)	from_chars (int)	to_chars (float)	from_chars (float)
gcc 11	undefined (or 201611) and `<charconv>` header	stdlib	stdlib	stdlib	stdlib	stdlib	stdlib	stdlib

Note: gcc 11 implements float too, but does not define __cpp_lib_to_chars