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std::ranges::greater(3) C++ Standard Libary std::ranges::greater(3) NAME std::ranges::greater - std::ranges::greater Synopsis Defined in header <functional> struct greater; (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 first argument is greater than the second (public member function) std::ranges::greater::operator() template< class T, class U > requires std::totally_ordered_with<T, U> // with different semantic requirements constexpr bool operator()(T&& t, U&& u) const; Compares t and u. Equivalent to return ranges::less{}(std::for- ward<U>(u), std::forward<T>(t));. Notes Unlike std::greater, std::ranges::greater requires all six compari- son operators <, <=, >, >=, == and != to be valid (via the totally_ordered_with con- straint) and is entirely defined in terms of std::ranges::less. 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 greater function object implementing x > y (class template) http://cppreference.com 2022.07.31 std::ranges::greater(3)
NAME | Synopsis | Member types | Member functions | Notes | Example | See also
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