std::ranges::not_equal_to
From cppreference.com
< cpp | utility | functional
Defined in header <functional>
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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).
Contents |
[edit] Nested types
Nested type | Definition |
is_transparent
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unspecified |
[edit] 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; |
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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.
[edit] 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.
[edit] Example
This section is incomplete Reason: no example |
[edit] 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 comparing pointers | only semantic requirements are relaxed |
[edit] See also
function object implementing x != y (class template) |