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std::ranges::not_equal_to(3) C++ Standard Libary std::ranges::not_equal_to(3) NAME std::ranges::not_equal_to - std::ranges::not_equal_to Synopsis Defined in header <functional> struct not_equal_to; (since C++20) Function object for performing comparisons. Deduces the parameter types of the function call operator from the arguments (but not the return type). Implementation-defined strict total order over pointers The function call operator yields the implementation-defined strict total order over pointers if the = operator between arguments invokes a built-in com- parison operator for a pointer, even if the built-in = operator does not. The implementation-defined strict total order is consistent with the partial order imposed by built-in comparison operators (<=>, <, >, <=, and >=), and consistent among following standard function objects: * std::less, std::greater, std::less_equal, and std::greater_equal, when the template argument is a pointer type or void * std::ranges::equal_to, std::ranges::not_equal_to, std::ranges::less, std::ranges::greater, std::ranges::less_equal, std::ranges::greater_equal, and std::compare_three_way Member types Member type Definition is_transparent /* unspecified */ Member functions operator() checks if the arguments are not equal (public member function) std::ranges::not_equal_to::operator() template< class T, class U > requires std::equality_comparable_with<T, U> // with different se- matic requirements constexpr bool operator()(T&& t, U&& u) const; Compares t and u. Equivalent to return !ranges::equal_to{}(std::for- ward<T>(t), std::forward<U>(u));. Notes Unlike std::not_equal_to, std::ranges::not_equal_to requires both == and != to be valid (via the equality_comparable_with constraint), and is entirely defined in terms of std::ranges::equal_to. Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 3530 C++20 syntactic checks were relaxed while only se- mantic requirements comparing pointers relaxed See also not_equal_to function object implementing x != y (class template) http://cppreference.com 2022.07.31 std::ranges::not_equal_to(3)
NAME | Synopsis | Member types | Member functions | Notes | Example | See also
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