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

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    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