Implement LWG-3767 codecvt<charN_t, char8_t, mbstate_t> incorrectly added to locale
#4542
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Shrink the primary template's `_ENFORCE_FACET_SPECIALIZATIONS` list because `codecvt_byname<char16_t, char8_t, mbstate_t>` and `codecvt_byname<char32_t, char8_t, mbstate_t>` are becoming (deprecated) explicit specializations. Note that `codecvt_byname<char16_t, char, mbstate_t>` and `codecvt_byname<char32_t, char, mbstate_t>` were simply missing. Add the old and new deprecated explicit specializations, the latter being guarded by `#ifdef __cpp_char8_t`. Note that (unlike the primary template) they can use the injected-class-name `codecvt` in their delegating constructors because it isn't dependent anymore. There didn't seem to be a simple way to centralize this repetition without adding too much complexity, so I just spammed it out. We need to `_STL_DISABLE_DEPRECATED_WARNING`/`_STL_RESTORE_DEPRECATED_WARNING` because the base classes are deprecated.
StephanTLavavej
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Apr 2, 2024
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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Fixes #4498. The message in warning STL4020 should also be changed.
I think
std::filesystem::pathis the only thing in the C++ standard library that can be used as a replacement.Currently this PR applies the deprecation to C++20 mode to be consistent with
_CXX20_DEPRECATE_CODECVT_FACETS, but I'm not sure whether this is appropriate.