std::experimental::ranges::not_equal_to
Defined in header <experimental/ranges/functional>
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template
<
class T =
void
>
requires EqualityComparable<T>
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(ranges TS) | |
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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>
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()
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constexpr
bool operator(
)
(
const T& x, const T& y)
const
;
|
(1) | (member only of primary not_equal_to<T> template) |
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template
<
class T, class U >
requires EqualityComparableWith<T, U>
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(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 !=
Example
| This section is incomplete Reason: no example |
See also
| function object implementing x != y (class template) |