std::logical_not<void> - cppreference.com

From cppreference.com


`template<> class logical_not<void>;`		(since C++14)

std::logical_not<void> is a specialization of std::logical_not with parameter and return type deduced.

applies operator! to its argument
(public member function)

std::logical_not<void>::operator()

`template< class T > constexpr auto operator()( T&& arg ) const -> decltype(!std::forward<T>(arg));`

Returns the result of !std::forward<T>(arg).

arg

value to apply logical NOT to

!std::forward<T>(arg).