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operator==,!=(std::experimental::function) - cppreference.com

From cppreference.com

Defined in header <experimental/functional> 

template< class R, class... ArgTypes >
bool operator==( const std::experimental::function<R(ArgTypes...)>& f,
                 std::nullptr_t ) noexcept;
(1) (library fundamentals TS) 
template< class R, class... ArgTypes >
bool operator==( std::nullptr_t,
                 const std::experimental::function<R(ArgTypes...)>& f ) noexcept;
(2) (library fundamentals TS)
(removed in library fundamentals TS v3) 
template< class R, class... ArgTypes >
bool operator!=( const std::experimental::function<R(ArgTypes...)>& f,
                 std::nullptr_t ) noexcept;
(3) (library fundamentals TS)
(removed in library fundamentals TS v3) 
template< class R, class... ArgTypes >
bool operator!=( std::nullptr_t,
                 const std::experimental::function<R(ArgTypes...)>& f ) noexcept;
(4) (library fundamentals TS)
(removed in library fundamentals TS v3)

Compares a std::experimental::function with a null pointer. Empty functions (that is, functions without a callable target) compare equal, non-empty functions compare non-equal.

The != operator is synthesized from operator==.

(library fundamentals TS v3)

Parameters

f - std::experimental::function to compare

Return value

1,2) !f

3,4) (bool) f

See also