Marek Kurdej a984dcaf7c [libc++] [P0482] [C++20] Implement missing bits for codecvt and codecvt_byname.
Add codecvt*<char16_t, char8_t> and codecvt*<char32_t, char8_t>.
Deprecate codecvt<char(16|32)_t, char>.
Enable disabled tests.
Update _LIBCPP_STD_VER to use 20 for C++20. Add _LIBCPP_DEPRECATED_IN_CXX20 macro.

Reviewed By: ldionne, #libc, #libc_abi

Differential Revision: https://reviews.llvm.org/D91517
2020-12-02 09:01:58 +01:00
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