std::experimental::ranges::not_equal_to
Defined in header <experimental/ranges/functional>
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||
template< class T = void > requires EqualityComparable<T> || |
(ranges TS) | |
template <> struct not_equal_to<void>; |
(ranges TS) | |
Function object for performing comparisons. The primary template invokes operator == on const lvalues of type T
and negates the result. The specialization not_equal_to<void>
deduces the parameter types of the function call operator from the arguments (but not the return type).
All specializations of not_equal_to
are Semiregular
.
Member types
Member type | Definition |
is_transparent (member only of not_equal_to<void> specialization)
|
/* unspecified */ |
Member functions
operator() |
checks if the arguments are not equal (public member function) |
std::experimental::ranges::not_equal_to::operator()
constexpr bool operator()(const T& x, const T& y) const; |
(1) | (member only of primary not_equal_to<T> template) |
template< class T, class U > requires EqualityComparableWith<T, U> || |
(2) | (member only of not_equal_to<void> specialization) |
t
and u
. Equivalent to return !ranges::equal_to<>{}(std::forward<T>(t), std::forward<U>(u));.
Notes
Unlike std::not_equal_to, ranges::not_equal_to
requires both ==
and !=
to be valid (via the EqualityComparable
and EqualityComparableWith
constraints), and is entirely defined in terms of
ranges::equal_to. However, the implementation is free to use operator!= directly, because those concepts require the results of ==
and !=
to be consistent.
Example
This section is incomplete Reason: no example |
See also
function object implementing x != y (class template) |