std::common_type<std::pair>

 

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Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (哋它亢++20) Dynamic memory management Program utilities Coroutine support (哋它亢++20) Variadic functions is_constant_evaluated (哋它亢++20) is_within_lifetime (哋它亢++26) initializer_list (哋它亢++11) source_location (哋它亢++20) Debugging support is_debugger_present (哋它亢++26) breakpoint_if_debugging (哋它亢++26) breakpoint (哋它亢++26) Three-way comparison three_way_comparablethree_way_comparable_with (哋它亢++20)(哋它亢++20) strong_ordering (哋它亢++20) weak_ordering (哋它亢++20) partial_ordering (哋它亢++20) common_comparison_category (哋它亢++20) compare_three_way_result (哋它亢++20) compare_three_way (哋它亢++20) strong_order (哋它亢++20) weak_order (哋它亢++20) partial_order (哋它亢++20) compare_strong_order_fallback (哋它亢++20) compare_weak_order_fallback (哋它亢++20) compare_partial_order_fallback (哋它亢++20)    is_eqis_ltis_lteq (哋它亢++20)(哋它亢++20)(哋它亢++20) is_neqis_gtis_gteq (哋它亢++20)(哋它亢++20)(哋它亢++20)

General utilities Date and time Function objects Formatting library (哋它亢++20) bitset hash (哋它亢++11) Relational operators (deprecated in 哋它亢++20) rel_ops::operator!=rel_ops::operator>     rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (哋它亢++20)(哋它亢++20)(哋它亢++20)    cmp_not_equalcmp_greatercmp_greater_than (哋它亢++20)(哋它亢++20)(哋它亢++20) in_range (哋它亢++20) Swap and type operations swap ranges::swap (哋它亢++20) exchange (哋它亢++14) declval (哋它亢++11) to_underlying (哋它亢++23) forward (哋它亢++11) forward_like (哋它亢++23) move (哋它亢++11) move_if_noexcept (哋它亢++11) as_const (哋它亢++17) Common vocabulary types pair tuple (哋它亢++11) optional (哋它亢++17) any (哋它亢++17) variant (哋它亢++17) tuple_size (哋它亢++11) tuple_element (哋它亢++11) apply (哋它亢++17) make_from_tuple (哋它亢++17) expected (哋它亢++23) Elementary string conversions to_chars (哋它亢++17) from_chars (哋它亢++17) chars_format (哋它亢++17) to_chars_result (哋它亢++17) from_chars_result (哋它亢++17)

 

std::pair

Member functions

pair::pair

pair::operator=

pair::swap (哋它亢++11)

Non-member functions

make_pair

operator==operator!=operator<operator<=operator>operator>=operator<=> (until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(哋它亢++20)

swap(std::pair) (哋它亢++11)

get(std::pair) (哋它亢++11)

Helper classes

tuple_size<std::pair> (哋它亢++11)

tuple_element<std::pair> (哋它亢++11)

basic_common_reference<std::pair> (哋它亢++23)

common_type<std::pair> (哋它亢++23)

formatter<std::pair> (哋它亢++23)

piecewise_construct_t (哋它亢++11)

Deduction guides(哋它亢++17)

 

Defined in header <utility>
template< class T1, class T2, class U1, class U2 >   requires requires { typename std::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 哋它亢++23)

The common type of two pairs is a pair of both common types of corresponding element types of both pairs.

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

Member types

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

See also

common_type (哋它亢++11)	determines the common type of a group of types (class template)
std::common_type<tuple-like> (哋它亢++23)	determines the common type of a tuple and a tuple-like type (class template specialization)