std::experimental::function

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.

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)

Member functions

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

Non-member functions

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

Helper classes

(removed in library fundamentals TS v3)
 specializes the std::uses_allocator type trait
(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 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...)>)
checks if a target is contained
(public member function of std::function<R(Args...)>)
invokes the target
(public member function of std::function<R(Args...)>)
Target access
obtains the typeid of the stored target
(public member function of std::function<R(Args...)>)
obtains a pointer to the stored target
(public member function of std::function<R(Args...)>)