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std::strict_weak_order(3) C++ Standard Libary std::strict_weak_order(3) NAME std::strict_weak_order - std::strict_weak_order Synopsis Defined in header <concepts> template < class R, class T, class U > (since C++20) concept strict_weak_order = std::relation<R, T, U>; The concept strict_weak_order<R, T, U> specifies that the relation R imposes a strict weak ordering on its arguments. Semantic requirements A relation r is a strict weak ordering if * it is irreflexive: for all x, r(x, x) is false; * it is transitive: for all a, b and c, if r(a, b) and r(b, c) are both true then r(a, c) is true; * let e(a, b) be !r(a, b) && !r(b, a), then e is transitive: e(a, b) && e(b, c) implies e(a, c). Under these conditions, it can be shown that e is an equivalence re- lation, and r induces a strict total ordering on the equivalence classes deter- mined by e. Notes The distinction between relation and strict_weak_order is purely se- mantic. http://cppreference.com 2022.07.31 std::strict_weak_order(3)
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