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std::experi...al::function(3) C++ Standard Libarystd::experi...al::function(3)

NAME
       std::experimental::function - std::experimental::function

Synopsis
	  Defined in header <experimental/functional>
	  template<  class  >				 (library fundamentals
       TS)
	  class	function; /* undefined */
	  template< class R, class... Args >		(library  fundamentals
       TS)
	  class	function<R(Args...)>

	  std::experimental::function  is  a modified version of std::function
       with support for
	  type-erased allocators.

Member types
	  Type		 Definition
			 std::experimental::erased_type	   (library  fundamen-
       tals TS)
	  allocator_type				   (until library fun-
       damentals TS v3)
			 std::pmr::polymorphic_allocator<>  (library fundamen-
       tals TS v3)

Member functions
					   constructs  a  new  std::experimen-
       tal::function
	  constructor			   instance
					   (public member function)
	  operator=			   assigns a new target
					   (public member function)
	  swap				   swaps the contents
					   (public member function)
	  get_memory_resource		    retrieves  a pointer to the	memory
       resource	used by
	  (removed in library fundamentals this	object to allocate memory
	  TS v3)			   (public member function)
					   retrieves a type-erased
	  get_allocator			       std::pmr::polymorphic_allocator
       used by this object
	  (library fundamentals	TS v3)	   to allocate memory
					   (public member function)

Non-member functions
	  std::experimental::swap(std::experimental::function) specializes the
       swap algorithm
							       (function  tem-
       plate)
	  operator==					       compares	an
	  operator!=					       std::experimen-
       tal::function
	  (removed in library fundamentals TS v3)	       with nullptr
							       (function  tem-
       plate)

Helper classes
							   specializes	   the
       std::uses_allocator
	  std::uses_allocator<std::experimental::function> type	trait
	  (removed in library fundamentals  TS	v3)	      (class  template
       specialization)

       Members identical to std::function

Member types
	  Type		       Definition
	  result_type	       R
		Member types removed in	Library	Fundamental TS v3
	  argument_type		T  if  sizeof...(Args) == 1 and	T is the first
       and only	type in
			       Args...
	  first_argument_type  T1 if sizeof...(Args) ==	2 and T1 is the	 first
       of the two types
			       in Args...
	  second_argument_type T2 if sizeof...(Args) ==	2 and T2 is the	second
       of the two
			       types in	Args...

	  Member types argument_type, first_argument_type, and	      (library
       fundamentals TS
	  second_argument_type are removed, because the	correponding  v3)
	  member types of std::function	are removed in C++20.

Member functions
	  destructor	destroys a std::function instance
			(public	member function	of std::function<R(Args...)>)
	  operator bool	checks if a target is contained
			(public	member function	of std::function<R(Args...)>)
	  operator()	invokes	the target
			(public	member function	of std::function<R(Args...)>)

Target access
	  target_type	obtains	the typeid of the stored target
			(public	member function	of std::function<R(Args...)>)
	  target	obtains	a pointer to the stored	target
			(public	member function	of std::function<R(Args...)>)

http://cppreference.com		  2024.06.10	 std::experi...al::function(3)

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