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std::char_traits<CharT>::eq, std::char_traits<CharT>::lt

(1) 
static bool eq( char_type a, char_type b );
 (until C++11) 
static constexpr bool eq( char_type a, char_type b ) noexcept;
 (since C++11)
(2) 
static bool lt( char_type a, char_type b );
 (until C++11) 
static constexpr bool lt( char_type a, char_type b ) noexcept;
 (since C++11)

Compares two characters.

1) Compares a and b for equality.
2) Compares a and b in such a way that they are totally ordered.

For the char specialization, eq and lt are defined identically to the built-in operators == and < for type unsigned char (not char).

 (since C++11)

Parameters

a, b - character values to compare

Return value

1) true if a and b are equal, false otherwise.
2) true if a is less than b, false otherwise.

Complexity

Constant.

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