# std::basic_common_reference<std::pair>

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< cpp‎ | utility‎ | pair

Defined in header `<utility>` |  |
template< class T1, class T2, class U1, class U2, template<class> class TQual, template<class> class UQual > requires requires { typename std::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 two `pair`s is a `pair` of both common reference types of corresponding element types of both `pair`s, where the cv and reference qualifiers on the `pair`s are applied to their element types.

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

### Member types

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

### Example

| This section is incomplete Reason: no example

### See also

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

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