operator==,!=(std::experimental::function)

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

(removed in C++20)
 compares a std::function with nullptr
(function template)