std::experimental::ranges::not_equal_to
| Defined in header <experimental/ranges/functional>
|
||
| 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) |