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#### Class `coroutine<>::pull_type`

    #include <boost/coroutine2/coroutine.hpp>

    template< typename R >
    class coroutine<>::pull_type
    {
    public:
        pull_type() noexcept;

        template< typename Fn >
        pull_type( Fn && fn, attributes const& attr = attributes() );

        template< typename Fn, typename StackAllocator >
        pull_type( Fn && fn, attributes const& attr, StackAllocator stack_alloc);

        pull_type( pull_type const& other)=delete;

        pull_type & operator=( pull_type const& other)=delete;

        ~pull_type();

        pull_type( pull_type && other) noexcept;

        pull_type & operator=( pull_type && other) noexcept;

        operator unspecified-bool-type() const noexcept;

        bool operator!() const noexcept;

        void swap( pull_type & other) noexcept;

        pull_type & operator()();

        R get() const;
    };

    template< typename R >
    void swap( pull_type< R > & l, pull_type< R > & r);

    template< typename R >
    range_iterator< pull_type< R > >::type begin( pull_type< R > &);

    template< typename R >
    range_iterator< pull_type< R > >::type end( pull_type< R > &);

###### `pull_type()`

Effects:

  Creates a coroutine representing not-a-coroutine.

Throws:

  Nothing.

###### `template< typename Fn > pull_type( Fn && fn, attributes const& attr)`

Preconditions:

  `size` >= minimum_stacksize(), `size` <= maximum_stacksize() when ! is_stack_unbounded().

Effects:

  Creates a coroutine which will execute `fn`, and enters it. Argument `attr` determines stack clean-up and preserving floating-point registers.

Throws:

  Exceptions thrown inside coroutine-function.

###### `template< typename Fn, typename StackAllocator > pull_type( Fn && fn, attributes const& attr, StackAllocator const& stack_alloc)`

Preconditions:

  `size` >= minimum_stacksize(), `size` <= maximum_stacksize() when ! is_stack_unbounded().

Effects:

  Creates a coroutine which will execute `fn`. Argument `attr` determines stack clean-up and preserving floating-point registers. For allocating/deallocating the stack `stack_alloc` is used.

Throws:

  Exceptions thrown inside coroutine-function.

###### `~pull_type()`

Effects:

  Destroys the context and deallocates the stack.

###### `pull_type( pull_type && other)`

Effects:

  Moves the internal data of `other` to `*this`. `other` becomes not-a-coroutine.

Throws:

  Nothing.

###### `pull_type & operator=( pull_type && other)`

Effects:

  Destroys the internal data of `*this` and moves the internal data of `other` to `*this`. `other` becomes not-a-coroutine.

Throws:

  Nothing.

###### `operator unspecified-bool-type() const`

Returns:

  If `*this` refers to not-a-coroutine or the coroutine-function has returned (completed), the function returns `false`. Otherwise `true`.

Throws:

  Nothing.

###### `bool operator!() const`

Returns:

  If `*this` refers to not-a-coroutine or the coroutine-function has returned (completed), the function returns `true`. Otherwise `false`.

Throws:

  Nothing.

###### `pull_type<> & operator()()`

Preconditions:

  `*this` is not a not-a-coroutine.

Effects:

  Execution control is transferred to coroutine-function (no parameter is passed to the coroutine-function).

Throws:

  Exceptions thrown inside coroutine-function.

###### `R get()`

    R    coroutine<R,StackAllocator>::pull_type::get();
    R&   coroutine<R&,StackAllocator>::pull_type::get();
    void coroutine<void,StackAllocator>::pull_type::get()=delete;

Preconditions:

  `*this` is not a not-a-coroutine.

Returns:

  Returns data transferred from coroutine-function via coroutine<>::push_type::operator().

Throws:

  `invalid_result`

Note:

  If `R` is a move-only type, you may only call `get()` once before the next coroutine<>::pull_type::operator() call.

###### `void swap( pull_type & other)`

Effects:

  Swaps the internal data from `*this` with the values of `other`.

Throws:

  Nothing.

###### Non-member function `swap()`

    template< typename R >
    void swap( pull_type< R > & l, pull_type< R > & r);

Effects:

  As if 'l.swap( r)'.

###### Non-member function `begin( pull_type< R > &)`

    template< typename R >
    range_iterator< pull_type< R > >::type begin( pull_type< R > &);

Returns:

  Returns a range-iterator (input-iterator).

###### Non-member function `end( pull_type< R > &)`

    template< typename R >
    range_iterator< pull_type< R > >::type end( pull_type< R > &);

Returns:

  Returns an end range-iterator (input-iterator).

Note:

  When first obtained from `begin( pull_type< R > &)`, or after some number of increment operations, an iterator will compare equal to the iterator returned by `end( pull_type< R > &)` when the corresponding coroutine<>::pull_type::operator bool would return `false`.