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      std::experimental::function

      From cppreference.com
       
      C++
       
      Experimental
       
      Library fundamentals
       
      Polymorphic allocator library
       
      Defined in header <experimental/functional>
      template<class>
      class function;/* undefined */
      		(library fundamentals TS)
      template<class R, class... Args>
      class function<R(Args...)>
      		(library fundamentals TS)

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

      Contents

      [edit]Member types

      Type Definition
      allocator_type

      std::experimental::erased_type

      		(library fundamentals TS)
      (until library fundamentals TS v3)

      std::pmr::polymorphic_allocator<>

      		(library fundamentals TS v3)

      [edit]Member functions

      		 constructs a new std::experimental::function instance
      (public member function)[edit]
      		 assigns a new target
      (public member function)[edit]
      		 swaps the contents
      (public member function)[edit]
      (removed in library fundamentals TS v3)
      		 retrieves a pointer to the memory resource used by this object to allocate memory
      (public member function)[edit]
      (library fundamentals TS v3)
      		 retrieves a type-erased std::pmr::polymorphic_allocator used by this object to allocate memory
      (public member function)[edit]

      [edit]Non-member functions

      		 specializes the swap algorithm
      (function template)[edit]
      (removed in library fundamentals TS v3)
      		 compares an std::experimental::function with nullptr
      (function template)[edit]

      [edit]Helper classes

      (removed in library fundamentals TS v3)
      		 specializes the std::uses_allocator type trait
      (class template specialization)[edit]

      Members identical to std::function

      Member types

      Type Definition
      result_typeR
      Member types removed in Library Fundamental TS v3
      argument_typeT if sizeof...(Args)==1 and T is the first and only type in Args...
      first_argument_typeT1 if sizeof...(Args)==2 and T1 is the first of the two types in Args...
      second_argument_typeT2 if sizeof...(Args)==2 and T2 is the second of the two types in Args...

      Member types argument_type, first_argument_type, and second_argument_type are removed, because the correponding member types of std::function are removed in C++20.

      		(library fundamentals TS v3)

      Member functions

      		 destroys a std::function instance
      (public member function of std::function<R(Args...)>)[edit]
      		 checks if a target is contained
      (public member function of std::function<R(Args...)>)[edit]
      		 invokes the target
      (public member function of std::function<R(Args...)>)[edit]
      Target access
      		obtains the typeid of the stored target
      (public member function of std::function<R(Args...)>)[edit]
      		 obtains a pointer to the stored target
      (public member function of std::function<R(Args...)>)[edit]
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