std::char_traits::eq, std::char_traits::lt

C++

Language

Headers

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Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

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Strings library

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Numerics library

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Regular expressions library (C++11)

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Technical Specifications

Strings library

Null-terminated strings

Byte strings

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Classes

basic_string

basic_string_view (C++17)

char_traits

std::char_traits

Member functions

char_traits::assign

char_traits::cmp

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 );			(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 );				(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.

Exceptions

(none)	(until C++11)
noexcept specification: noexcept	(since C++11)

Complexity

Constant.