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std::experi...onReference(3) C++ Standard Libary std::experi...onReference(3) NAME std::experimental::ranges::CommonReference - std::experimen- tal::ranges::CommonReference Synopsis Defined in header <experimental/ranges/concepts> template < class T, class U > concept bool CommonReference = Same<ranges::common_reference_t<T, U>, ranges::common_reference_t<U, (ranges TS) T>> && ConvertibleTo<T, ranges::common_reference_t<T, U>> && ConvertibleTo<U, ranges::common_reference_t<T, U>>; The concept CommonReference<T, U> specifies that two types T and U share a common reference type (as computed by ranges::common_reference_t) to which both can be converted. CommonReference<T, U> is satisfied only if, given expressions t and u such that decltype((t)) is T and decltype((u)) is U, * ranges::common_reference_t<T, U>(t) is equal to ranges::com- mon_reference_t<T, U>(t) if and only if t is an equality-preserving expression; and * ranges::common_reference_t<T, U>(u) is equal to ranges::com- mon_reference_t<T, U>(u) if and only if u is an equality-preserving expression. In other words, the conversion to the common reference type must not alter the equality-preservation property of the original expression. Equality preservation An expression is equality preserving if it results in equal outputs given equal inputs. * The inputs to an expression consist of its operands. * The outputs of an expression consist of its result and all operands modified by the expression (if any). Every expression required to be equality preserving is further re- quired to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects. See also common_reference determine the common reference type of a set of types (class template) Common specifies that two types share a common type (concept) common_type determine the common type of a set of types (class template) http://cppreference.com 2022.07.31 std::experi...onReference(3)
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