Fix deprecation warning in libc++ (LLVM-16) #3634
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vitaut
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Sep 16, 2023
| # ifdef _LIBCPP_VERSION | ||
| namespace std { | ||
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| template <> struct char_traits<custom_char> { |
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Does the standard permit user specializations of char_traits?
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https://en.cppreference.com/w/cpp/string/char_traits:
The char_traits class template serves as a basis for explicit instantiations. The user can provide a specialization for any custom character types. Several explicit specializations are provided for the standard character types (see below), other specializations are not required to satisfy the requirements of CharTraits.
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…or T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided for a temporary period. It will be removed in LLVM 18, so please migrate off of it. [-Werror,-Wdeprecated-declarations] Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
vitaut
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…or T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided for a temporary period. It will be removed in LLVM 18, so please migrate off of it. [-Werror,-Wdeprecated-declarations] (fmtlib#3634) Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
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Warning:
LLVM source:
https://github.com/llvm/llvm-project/blob/7cbf1a2591520c2491aa35339f227775f4d3adf6/libcxx/include/__string/char_traits.h#L74-L80