operator== (std::copyable_function)

friend bool operator == ( const std:: copyable_function & f, std:: nullptr_t ) noexcept ;		(since C++26)

Checks whether the wrapper f has a callable target by formally comparing it with std::nullptr_t . Empty wrappers (that is, wrappers without a target) compare equal, non-empty functions compare non-equal.

This function is not visible to ordinary unqualified or qualified lookup , and can only be found by argument-dependent lookup when std::copyable_function<FunctionType> is an associated class of the arguments.

The != operator is synthesized from operator== .

Parameters

f

-

std::copyable_function to compare

Return value

! f .

Example

This section is incomplete Reason: no example

See also

operator bool	checks if the std::copyable_function has a target (public member function)
operator== operator!= (removed in C++20)	compares a std::function with nullptr (function template)
operator== (C++23)	compares a std::move_only_function with nullptr (function)