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).

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 >
constexpr bool operator()( T&& t, U&& u ) const;

Equivalent to return !ranges::less{}(std::forward<U>(u), std::forward<T>(t));.

This overload participates in overload resolution only if
std::totally_ordered_with<T, U> is satisfied.

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 only semantic requirements are
while comparing pointers relaxed

See also¶

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

Category:¶

* Todo no example