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std::char_traits<char>::eq/lt, std::char_traits<wchar_t>::eq/lt, std::char_traits<char8_t>::eq/lt, std::char_traits<char16_t>::eq/lt, std::char_traits<char32_t>::eq/lt

From cppreference.com
< cpp‎ | string‎ | char traits
 
C++
 
Strings library
 
std::char_traits
 
static bool eq( char_type a, char_type b );
 (1) (constexpr since C++11)
(noexcept since C++11)
static bool lt( char_type a, char_type b );
 (2) (constexpr since C++11)
(noexcept since C++11)

Compares two characters.

1) Compares a and b for equality, behaves identically to
  • static_cast<unsigned char>(a) == static_cast<unsigned char>(b), if char_type is char,
  • a == b otherwise.
2) Compares a and b in such a way that they are totally ordered, behaves identically to
  • static_cast<unsigned char>(a) < static_cast<unsigned char>(b), if char_type is char,
  • a < b otherwise.

See