std::common_type<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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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
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to_underlying (C++23)

forward (C++11)
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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> requires requires{typenamestd::pair<std::common_type_t<T1, U1>, std::common_type_t<T2, U2>>;} struct common_type<std::pair<T1, T2>,std::pair<U1, U2>>;		(since C++23)

The common type of twopairs is apair of both common types of corresponding element types of bothpairs.

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

[edit]Member types

Member type	Definition
`type`	std::pair<std::common_type_t<T1, U1>,std::common_type_t<T2, U2>>

[edit]Example

This section is incomplete
Reason: no example

[edit]See also

common_type (C++11)	determines the common type of a group of types (class template)[edit]
std::common_type<tuple-like> (C++23)	determines the common type of a`tuple` and a`tuple-like` type (class template specialization)[edit]