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std::experi...on::function(3) C++ Standard Libarystd::experi...on::function(3) NAME std::experimental::function::function - std::experimental::func- tion::function Synopsis (library function() noexcept; (1) fundamen- tals TS) function( (library std::nullptr_t ) (2) fundamentals noexcept; TS) function( const (library function& other ); (3) fundamen- tals TS) function( function&& (library other ); (4) fundamentals TS) template< class F > (library func- tion( F f ); (5) fundamentals TS) template< class Alloc > (library function( fundamentals std::allo- cator_arg_t, TS) const Alloc& alloc ) noexcept; func- tion( std::allocator_arg_t, (library const fundamentals allocator_type& al- loc TS v3) ) noexcept; template< class Alloc > function( (library std::allo- cator_arg_t, fundamentals const Alloc& alloc, TS) std::nullptr_t ) noexcept; function( std::allocator_arg_t, const allo- cator_type& (library alloc, fundamentals TS v3) std::nullptr_t ) noexcept; template< class Alloc > function( (li- brary std::allocator_arg_t, fundamentals const Alloc& alloc, (6) TS) const function& other ); function( std::allocator_arg_t, (library const allocator_type& (7) fundamentals alloc, TS v3) const function& other ); template< class Alloc > function( (library std::allocator_arg_t, (8) fundamentals const Alloc& alloc, TS) function&& other ); function( std::allocator_arg_t, (library const allocator_type& fundamentals alloc, (9) TS v3) function&& other ); template< class F, class Alloc > (library function( fundamentals std::allocator_arg_t, TS) const Alloc& alloc, F (10) f ); function( (library std::allocator_arg_t, fundamentals const allocator_type& TS v3) alloc, F f ); Constructs a std::experimental::function from a variety of sources. 1,2) Creates an empty function. 3) Copies the target of other to the target of *this. If other is empty, *this will be empty after the call too. 4) Moves the target of other to the target of *this. If other is empty, *this will be empty after the call too. After construction, *this stores a copy of other.get_allocator(). (library fundamentals TS v3) 5) Initializes the target with a copy of f. If f is a null pointer to function or null pointer to member, *this will be empty after the call. This constructor does not participate in overload resolution unless f is Callable for ar- gument types Args... and return type R. 6-10) Same as (1-5) except that alloc is used to allocate memory for any internal data structures that the function might use. These constructors treat alloc as a type-erased allocator (see be- low). (until library fundamentals TS v3) After construction via (1-5), this->get_memory_resource() (library returns the same value as fundamentals TS) std::experimental::pmr::get_default_resource() during (until library construction. fundamentals TS v3) After construction via (1-3) and (5), *this stores a default (library constructed std::pmr::polymorphic_allocator<>. fundamentals TS v3) When the target is a function pointer or a std::reference_wrapper, small object optimization is guaranteed, that is, these targets are always di- rectly stored inside the std::experimental::function object, no dynamic allocation takes place. Other large objects may be constructed in dynamic allocated storage and accessed by the std::experimental::function object through a pointer. If a constructor moves or copies a function object, including an in- stance of std::experimental::function, then that move or copy is performed by using-allocator construction with allocator this->get_memory_resource() (until library fundamentals TS v3) this->get_allocator() (library fundamentals TS v3). Parameters other - the function object used to initialize *this f - a callable used to initialize *this alloc - an allocator used for internal memory allocation Type requirements - F must meet the requirements of Callable and CopyConstructible. Exceptions 3,8) Does not throw if other's target is a function pointer or a std::reference_wrapper, otherwise may throw std::bad_alloc or any exception thrown by the copy constructor of the stored callable object. 4) (none) 5,10) Does not throw if f is a function pointer or a std::refer- ence_wrapper, otherwise may throw std::bad_alloc or any exception thrown by the copy constructor of the stored callable object. 9) (none) Example This section is incomplete Reason: no example Category: * Todo no example http://cppreference.com 2024.06.10 std::experi...on::function(3)
NAME | Synopsis | Parameters | Type requirements | Exceptions | Example | Category:
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