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std::experi...es::Relation(3) C++ Standard Libarystd::experi...es::Relation(3) NAME std::experimental::ranges::Relation - std::experimental::ranges::Rela- tion Synopsis Defined in header <experimental/ranges/concepts> template <class R, class T, class U> concept bool Relation = Predicate<R, T, T> && Predicate<R, U, U> && CommonReference< const std::remove_reference_t<T>&, const std::remove_reference_t<U>&> && Predicate<R, (1) (ranges TS) ranges::common_reference_t< const std::remove_reference_t<T>&, const std::remove_reference_t<U>&>, ranges::common_reference_t< const std::remove_reference_t<T>&, const std::remove_reference_t<U>&>> && Predicate<R, T, U> && Predicate<R, U, T>; The concept Relation<R, T, U> specifies that R defines a binary re- lation over the set of expressions whose type and value category are those encoded by either T or U. Given * r, an expression such that decltype((r)) is R, * t, an expression such that decltype((t)) is T, * u, an expression such that decltype((u)) is U, and let C be ranges::common_reference_t<const std::remove_refer- ence_t<T>&, const std::remove_reference_t<U>&>, then Relation<R, T, U> is satisfied only if * bool(r(t, u)) == bool(r(C(t), C(u))) and * bool(r(u, t)) == bool(r(C(u), C(t))). http://cppreference.com 2022.07.31 std::experi...es::Relation(3)
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