NAME¶

std::ranges::not_equal_to - std::ranges::not_equal_to

Synopsis¶

Defined in header <functional>
struct not_equal_to; (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 arguments are not equal
(public member function)

std::ranges::not_equal_to::operator()

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

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

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

Notes¶

Unlike std::not_equal_to, std::ranges::not_equal_to requires both == and != to be
valid (via the equality_comparable_with constraint), and is entirely defined in
terms of std::ranges::equal_to.

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¶

not_equal_to function object implementing x != y
(class template)

Category:¶

* Todo no example