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std::char_traits<char>::eq_int_type, std::char_traits<wchar_t>::eq_int_type, std::char_traits<char8_t>::eq_int_type, std::char_traits<char16_t>::eq_int_type, std::char_traits<char32_t>::eq_int_type

From cppreference.com
< cpp‎ | string‎ | char traits