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

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

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Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

char_traits

 

std::char_traits

Member functions

char_traits::assign

char_traits::eqchar_traits::lt

char_traits::move

char_traits::copy

char_traits::compare

char_traits::length

char_traits::find

char_traits::to_char_type

char_traits::to_int_type

char_traits::eq_int_type

char_traits::eof

char_traits::not_eof

 

	(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.