std::experimental::ranges::not_equal_to(3)

NAME
std::experimental::ranges::not_equal_to - std::experimental::ranges::not_equal_to

Synopsis
   Defined in header <experimental/ranges/functional>
   template< class T = void >
       requires EqualityComparable<T> ||
                Same<T, void> || (ranges TS)
                /* == on two const T lvalues invokes a built-in operator
   comparing pointers */
   struct not_equal_to;
   template<> (ranges TS)
   struct not_equal_to<void>;
   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 (1) (member only of primary
   T& y) const; not_equal_to<T> template)
   template< class T, class U >
       requires EqualityComparableWith<T, U> ||
                /* std::declval<T>() ==
   std::declval<U>() resolves to (2) (member only of not_equal_to<void>
                   a built-in operator comparing specialization)
   pointers */
   constexpr bool operator()(T&& t, U&& u)
   const;
   1) Compares x and y. Equivalent to return !ranges::equal_to<>{}(x, y);.
   2) Compares 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
   not_equal_to function object implementing x != y
                (class template)

Category:
     * Todo no example