std::experimental::function::operator=(3)

NAME
std::experimental::function::operator= - std::experimental::function::operator=

Synopsis
   function& operator=( const function& other (1) (library
   ); fundamentals TS)
   function& operator=( function&& other ); (2) (library
                        fundamentals TS)
   function& operator=( std::nullptr_t ) (3) (library
   noexcept; fundamentals TS)
   template< class F > (4) (library
   function& operator=( F&& f ); fundamentals TS)
   template< class F > (library
   function& operator=( fundamentals TS)
   std::reference_wrapper<F> f ); (5)
   template< class F > (library
   function& operator=( fundamentals TS v3)
   std::reference_wrapper<F> f ) noexcept;
   Assigns a new target to std::experimental::function. In the description below, let
   ALLOCATOR_OF(f) be the allocator specified in the construction of f, or
   the value of std::experimental::pmr::get_default_resource()
   (until library fundamentals TS v3)
   the default-constructed std::pmr::polymorphic_allocator<> value
   (library fundamentals TS v3) at the time of construction if no allocator was
   specified.
   1) Assigns a copy of target of other, as if by executing
   function(std::allocator_arg, ALLOCATOR_OF(*this), other).swap(*this);.
   2) Moves the target of other to *this, as if by executing
   function(std::allocator_arg, ALLOCATOR_OF(*this), std::move(other)).swap(*this);.
   other is in a valid state with an unspecified value.
   3) Destroys the target of *this. *this is empty after the call. The memory resource
   returned by get_memory_resource() after the assignment is equivalent to the memory
   resource before the assignment, but the address may change.
   4) Sets the target of *this to the callable f, as if by executing
   function(std::allocator_arg, ALLOCATOR_OF(*this),std::forward<F>(f)).swap(*this);.
   This operator does not participate in overload resolution unless f is Callable for
   argument types Args... and return type R.
   5) Sets the target of *this to a copy of f, as if by executing
   function(std::allocator_arg, ALLOCATOR_OF(*this), f).swap(*this);.

Parameters
   other - another std::experimental::function object to copy or move from
   f - a callable to initialize the target with

Type requirements
   -
   F must meet the requirements of Callable.

Return value
   *this

Exceptions
   1,2,4) Exception thrown on needed allocation of the storage or initialization of the
   target of *this, if any.
   5) (none)

Notes
   The move assignment operator may need to allocate storage if
   get_memory_resource() != other.get_memory_resource()
   (until library fundamentals TS v3)
   get_allocator() != other.get_allocator()
   (library fundamentals TS v3)

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