std::common_reference_with(3) C++ Standard Libary std::common_reference_with(3) NAME std::common_reference_with - std::common_reference_with Synopsis Defined in header <concepts> template< class T, class U > concept common_reference_with = std::same_as<std::common_reference_t<T, U>, (since C++20) std::common_reference_t<U, T>> && std::convertible_to<T, std::common_reference_t<T, U>> && std::convertible_to<U, std::common_reference_t<T, U>>; The concept common_reference_with<T, U> specifies that two types T and U share a common reference type (as computed by std::common_reference_t) to which both can be converted. Semantic requirements T and U model std::common_reference_with<T, U> only if, given equality- preserving expressions t1, t2, u1 and u2 such that decltype((t1)) and de- cltype((t2)) are both T and decltype((u1)) and decltype((u2)) are both U, * std::common_reference_t<T, U>(t1) equals std::common_reference_t<T, U>(t2) if and only if t1 equals t2; and * std::common_reference_t<T, U>(u1) equals std::common_reference_t<T, U>(u2) if and only if u1 equals u2. In other words, the conversion to the common reference type must pre- serve equality. See also common_reference determines the common reference type of a group of types basic_common_reference (class template) (C++20) common_with specifies that two types share a common type (C++20) (concept) common_type determines the common type of a group of types (C++11) (class template) http://cppreference.com 2024.06.10 std::common_reference_with(3)
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