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std::strong_order(3) C++ Standard Libary std::strong_order(3) NAME std::strong_order - std::strong_order Synopsis Defined in header <compare> inline namespace /* unspecified */ { inline constexpr /* unspecified */ strong_order = /* unspecified (since C++20) */; } Call signature template< class T, class U > requires /* see below */ constexpr std::strong_ordering strong_order( T&& t, U&& u ) noexcept(/* see below */); Compares two values using 3-way comparison and produces a result of type std::strong_ordering. Let t and u be expressions and T and U denote decltype((t)) and de- cltype((u)) respectively, std::strong_order(t, u) is expression-equivalent to: * If std::is_same_v<std::decay_t<T>, std::decay_t<U>> is true: * std::strong_ordering(strong_order(t, u)), if it is a well- formed expression with overload resolution performed in a context that does not include a declaration of std::strong_order, * otherwise, if T is a floating-point type: * if std::numeric_limits<T>::is_iec559 is true, performs the ISO/IEC/IEEE 60559 totalOrder comparison of floating- point values and returns that result as a value of type std::strong_or- dering (note: this comparison can distinguish between the positive and negative zero and between the NaNs with different representations), * otherwise, yields a value of type std::strong_ordering that is consistent with the ordering observed by T's compari- son operators, * otherwise, std::strong_ordering(std::compare_three_way()(t, u)) if it is well-formed. * In all other cases, the expression is ill-formed, which can re- sult in substitution failure when it appears in the immediate context of a template instantiation. Example This section is incomplete Reason: no example See also strong_ordering the result type of 3-way comparison that supports all (C++20) 6 operators and is substitutable (class) weak_order performs 3-way comparison and produces a result of (C++20) type std::weak_ordering (customization point object) partial_order performs 3-way comparison and produces a result of (C++20) type std::partial_ordering (customization point object) performs 3-way comparison and produces a result of compare_strong_order_fallback type std::strong_ordering, even if op- erator<=> is (C++20) unavailable (customization point object) Category: * Todo no example http://cppreference.com 2024.06.10 std::strong_order(3)
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