std::ranges::less_equal(3)

NAME
std::ranges::less_equal - std::ranges::less_equal

Synopsis
   Defined in header <functional>
   struct less_equal; (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 comparison 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 less than or equal to the second
              (public member function) std::ranges::less_equal::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::forward<U>(u),
   std::forward<T>(t));.

Notes
   Unlike std::less_equal, std::ranges::less_equal requires all six comparison
   operators <, <=, >, >=, == and != to be valid (via the totally_ordered_with
   constraint) 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 retroactively to
   previously published C++ standards.
      DR Applied to Behavior as published Correct behavior
   LWG 3530 C++20 syntactic checks were relaxed while only semantic requirements
                       comparing pointers relaxed

See also
   less_equal function object implementing x <= y
              (class template)