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

From cppreference.com
C++
Experimental
Library fundamentals
Polymorphic allocator library
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)
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