P3107R5 Permit An Efficient Implementation Of <print>

[StephanTLavavej]

WG21-P3107R5 Permit An Efficient Implementation Of <print>
WG21-P3235R3 std::print More Types Faster With Less Memory

INCREASED feature-test macro:

#define __cpp_lib_print 202406L

These papers were formally accepted as Defect Reports, retroactively amending C++23.

[frederick-vs-ja]

_fputc_nolock and _fwrite_nolock of UCRT seem useful here. However, they still create a __crt_cached_ptd_host guard object for each call, and such overhead seems significant for _fputc_nolock. I wonder whether we can furtherly optimize the underlying calls.