operator==,!=,<,<=,>,>=,<=>(std::{{{1}}})

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

vector<bool>

inplace_vector (C++26)

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

mdspan (C++23)

Tables

Iterator invalidation

Member function table

Non-member function table

 

template< ... > bool operator==( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(1)
template< ... > bool operator!=( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(2)
template< ... > bool operator< ( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(3)
template< ... > bool operator<=( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(4)
template< ... > bool operator> ( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(5)
template< ... > bool operator>=( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(6)
template< class T, std::three_way_comparable Container > std::compare_three_way_result_t<Container>     operator<=>( const std::{{{1}}}<...>& lhs,                  const std::{{{1}}}<...>& rhs );	(7)	(since C++20)

Compares the contents of the underlying containers of two container adaptors. The comparison is done by applying the corresponding operator to the underlying containers.

Parameters

lhs, rhs	-	container adaptors whose contents to compare
- T must meet the requirements of EqualityComparable.

Return value

1-6) true if the corresponding comparison yields true, false otherwise.

7) Result of three-way comparison on underlying containers.

Complexity

Linear in the size of the container.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 410	C++98	the semantics of were missing	added