| Defined in header |
Function object for performing comparisons. Deduces the parameter types of the function call operator from the arguments (but not the return type).
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 consistent among following standard function objects:
std::greater_equal, when the template argument is a pointer type or
| ||/* unspecified */|
| checks if the first argument is less than or equal to the second
(public member function)
template< class T, class U > requires std::totally_ordered_with<T, U> // with different semantic requirements constexpr bool operator()(T&& t, U&& u) const;
std::ranges::less_equal requires all six comparison operators
!= to be valid (via the
totally_ordered_with constraint) and is entirely defined in terms of
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 comparing pointers||only semantic requirements relaxed|
| function object implementing
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