std::experimental::ranges::not_equal_to
<experimental/ranges/functional>
requires EqualityComparable<T> ||
Same<T, void> ||
/* == on two const T lvalues invokes a built-in operator comparing pointers */
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.
Contents
[edit] Member types
is_transparent (member only of not_equal_to<void> specialization)
/* unspecified */
[edit] Member functions
(public member function)
std::experimental::ranges::not_equal_to::operator()
not_equal_to<T> template)
requires EqualityComparableWith<T, U> ||
/* std::declval<T>() == std::declval<U>() resolves to
a built-in operator comparing pointers */
not_equal_to<void> specialization)
t and u. Equivalent to return !ranges::equal_to <>{}(std::forward <T>(t), std::forward <U>(u));.
[edit] 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.
[edit] Example
Reason: no example