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.

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)

operator==(std::copyable_function)

Parameters

Return value

Example

See also