# std::common_type<std::pair>

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< cpp‎ | utility‎ | pair

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 C++23)

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

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>>

### Example

| This section is incomplete Reason: no example

### See also

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

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