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).
 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::less, std::ranges::greater, std::ranges::less_equal, std::ranges::greater_equal, and std::compare_three_way
 Member types
||/* unspecified */|
 Member functions
| 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> ||
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
std::ranges::less. However, the implementation is free to use operator<= directly, because those concepts require the results of the comparison operators to be consistent.
|This section is incomplete|
Reason: no example
 See also
| function object implementing x <= y |