std::basic_common_reference<std::pair>

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Utilities library

Language support

Type support (basic types, RTTI)

Library feature-test macros(C++20)

Program utilities

Variadic functions

initializer_list

(C++11)

is_constant_evaluated

(C++20)

is_within_lifetime

(C++26)

source_location

(C++20)

Coroutine support(C++20)

Contract support(C++26)

Three-way comparison

three_way_comparablethree_way_comparable_with

(C++20)(C++20)

strong_ordering

(C++20)

weak_ordering

(C++20)

partial_ordering

(C++20)

common_comparison_category

(C++20)

compare_three_way_result

(C++20)

(C++20)

(C++20)

(C++20)

(C++20)

compare_strong_order_fallback

(C++20)

compare_weak_order_fallback

(C++20)

compare_partial_order_fallback

(C++20)

is_eqis_ltis_lteq

(C++20)(C++20)(C++20)

is_neqis_gtis_gteq

(C++20)(C++20)(C++20)

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bitset
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rel_ops::operator!=rel_ops::operator>

rel_ops::operator<=rel_ops::operator>=

Integer comparison functions

cmp_equalcmp_lesscmp_less_than

(C++20)(C++20)(C++20)

cmp_not_equalcmp_greatercmp_greater_than

(C++20)(C++20)(C++20)

in_range

(C++20)

Swap andtype operations

swap
ranges::swap (C++20)
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declval (C++11)
to_underlying (C++23)

forward (C++11)
forward_like (C++23)
move (C++11)
move_if_noexcept (C++11)
as_const (C++17)

Common vocabulary types

pair
tuple (C++11)
optional (C++17)
any (C++17)
variant (C++17)

tuple_size (C++11)
tuple_element (C++11)
apply (C++17)
make_from_tuple (C++17)
expected (C++23)

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std::pair

Member functions
pair::pair
pair::operator=
pair::swap (C++11)
Non-member functions
make_pair
operator==operator!=operator<operator<=operator>operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)
swap(std::pair) (C++11)
get(std::pair) (C++11)
Helper classes
tuple_size<std::pair> (C++11)
tuple_element<std::pair> (C++11)
basic_common_reference<std::pair> (C++23)
common_type<std::pair> (C++23)
formatter<std::pair> (C++23)
piecewise_construct_t (C++11)
Deduction guides(C++17)

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Defined in header`<utility>`
template<class T1,class T2,class U1,class U2, template<class>class TQual,template<class>class UQual> requires requires{typenamestd::pair<std::common_reference_t<TQual<T1>, UQual<U1>>, std::common_reference_t<TQual<T2>, UQual<U2>>>;} struct basic_common_reference<std::pair<T1, T2>,std::pair<U1, U2>, TQual, UQual>;		(since C++23)

The common reference type of twopairs is apair of both common reference types of corresponding element types of bothpairs, where the cv and reference qualifiers on thepairs are applied to their element types.

The common reference type is defined only if both pairs of corresponding element types have common reference types.

[edit]Member types

Member type	Definition
`type`	std::pair<std::common_reference_t<TQual<T1>, UQual<U1>>, std::common_reference_t<TQual<T2>, UQual<U2>>>

[edit]Example

This section is incomplete
Reason: no example

[edit]See also

common_referencebasic_common_reference (C++20)	determines the common reference type of a group of types (class template)[edit]
std::basic_common_reference<tuple-like> (C++23)	determines the common reference type of a`tuple` and a`tuple-like` type (class template specialization)[edit]