stl_deque.h

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        {
	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
	  _M_assign_dispatch(__first, __last, _Integral());
	}

      /// Get a copy of the memory allocation object.
      allocator_type
      get_allocator() const
      { return _Base::get_allocator(); }

      // iterators
      /**
       *  Returns a read/write iterator that points to the first element in the
       *  %deque.  Iteration is done in ordinary element order.
       */
      iterator
      begin()
      { return this->_M_impl._M_start; }

      /**
       *  Returns a read-only (constant) iterator that points to the first
       *  element in the %deque.  Iteration is done in ordinary element order.
       */
      const_iterator
      begin() const
      { return this->_M_impl._M_start; }

      /**
       *  Returns a read/write iterator that points one past the last
       *  element in the %deque.  Iteration is done in ordinary
       *  element order.
       */
      iterator
      end()
      { return this->_M_impl._M_finish; }

      /**
       *  Returns a read-only (constant) iterator that points one past
       *  the last element in the %deque.  Iteration is done in
       *  ordinary element order.
       */
      const_iterator
      end() const
      { return this->_M_impl._M_finish; }

      /**
       *  Returns a read/write reverse iterator that points to the
       *  last element in the %deque.  Iteration is done in reverse
       *  element order.
       */
      reverse_iterator
      rbegin()
      { return reverse_iterator(this->_M_impl._M_finish); }

      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to the last element in the %deque.  Iteration is done in
       *  reverse element order.
       */
      const_reverse_iterator
      rbegin() const
      { return const_reverse_iterator(this->_M_impl._M_finish); }

      /**
       *  Returns a read/write reverse iterator that points to one
       *  before the first element in the %deque.  Iteration is done
       *  in reverse element order.
       */
      reverse_iterator
      rend() { return reverse_iterator(this->_M_impl._M_start); }

      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to one before the first element in the %deque.  Iteration is
       *  done in reverse element order.
       */
      const_reverse_iterator
      rend() const
      { return const_reverse_iterator(this->_M_impl._M_start); }

      // [23.2.1.2] capacity
      /**  Returns the number of elements in the %deque.  */
      size_type
      size() const
      { return this->_M_impl._M_finish - this->_M_impl._M_start; }

      /**  Returns the size() of the largest possible %deque.  */
      size_type
      max_size() const
      { return size_type(-1); }

      /**
       *  @brief  Resizes the %deque to the specified number of elements.
       *  @param  new_size  Number of elements the %deque should contain.
       *  @param  x  Data with which new elements should be populated.
       *
       *  This function will %resize the %deque to the specified
       *  number of elements.  If the number is smaller than the
       *  %deque's current size the %deque is truncated, otherwise the
       *  %deque is extended and new elements are populated with given
       *  data.
       */
      void
      resize(size_type __new_size, value_type __x = value_type())
      {
	const size_type __len = size();
	if (__new_size < __len)
	  erase(this->_M_impl._M_start + __new_size, this->_M_impl._M_finish);
	else
	  insert(this->_M_impl._M_finish, __new_size - __len, __x);
      }

      /**
       *  Returns true if the %deque is empty.  (Thus begin() would
       *  equal end().)
       */
      bool
      empty() const
      { return this->_M_impl._M_finish == this->_M_impl._M_start; }

      // element access
      /**
       *  @brief Subscript access to the data contained in the %deque.
       *  @param n The index of the element for which data should be
       *  accessed.
       *  @return  Read/write reference to data.
       *
       *  This operator allows for easy, array-style, data access.
       *  Note that data access with this operator is unchecked and
       *  out_of_range lookups are not defined. (For checked lookups
       *  see at().)
       */
      reference
      operator[](size_type __n)
      { return this->_M_impl._M_start[difference_type(__n)]; }

      /**
       *  @brief Subscript access to the data contained in the %deque.
       *  @param n The index of the element for which data should be
       *  accessed.
       *  @return  Read-only (constant) reference to data.
       *
       *  This operator allows for easy, array-style, data access.
       *  Note that data access with this operator is unchecked and
       *  out_of_range lookups are not defined. (For checked lookups
       *  see at().)
       */
      const_reference
      operator[](size_type __n) const
      { return this->_M_impl._M_start[difference_type(__n)]; }

    protected:
      /// @if maint Safety check used only from at().  @endif
      void
      _M_range_check(size_type __n) const
      {
	if (__n >= this->size())
	  __throw_out_of_range(__N("deque::_M_range_check"));
      }

    public:
      /**
       *  @brief  Provides access to the data contained in the %deque.
       *  @param n The index of the element for which data should be
       *  accessed.
       *  @return  Read/write reference to data.
       *  @throw  std::out_of_range  If @a n is an invalid index.
       *
       *  This function provides for safer data access.  The parameter
       *  is first checked that it is in the range of the deque.  The
       *  function throws out_of_range if the check fails.
       */
      reference
      at(size_type __n)
      {
	_M_range_check(__n);
	return (*this)[__n];
      }

      /**
       *  @brief  Provides access to the data contained in the %deque.
       *  @param n The index of the element for which data should be
       *  accessed.
       *  @return  Read-only (constant) reference to data.
       *  @throw  std::out_of_range  If @a n is an invalid index.
       *
       *  This function provides for safer data access.  The parameter is first
       *  checked that it is in the range of the deque.  The function throws
       *  out_of_range if the check fails.
       */
      const_reference
      at(size_type __n) const
      {
	_M_range_check(__n);
	return (*this)[__n];
      }

      /**
       *  Returns a read/write reference to the data at the first
       *  element of the %deque.
       */
      reference
      front()
      { return *begin(); }

      /**
       *  Returns a read-only (constant) reference to the data at the first
       *  element of the %deque.
       */
      const_reference
      front() const
      { return *begin(); }

      /**
       *  Returns a read/write reference to the data at the last element of the
       *  %deque.
       */
      reference
      back()
      {
	iterator __tmp = end();
	--__tmp;
	return *__tmp;
      }

      /**
       *  Returns a read-only (constant) reference to the data at the last
       *  element of the %deque.
       */
      const_reference
      back() const
      {
	const_iterator __tmp = end();
	--__tmp;
	return *__tmp;
      }

      // [23.2.1.2] modifiers
      /**
       *  @brief  Add data to the front of the %deque.
       *  @param  x  Data to be added.
       *
       *  This is a typical stack operation.  The function creates an
       *  element at the front of the %deque and assigns the given
       *  data to it.  Due to the nature of a %deque this operation
       *  can be done in constant time.
       */
      void
      push_front(const value_type& __x)
      {
	if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_first)
	  {
	    this->_M_impl.construct(this->_M_impl._M_start._M_cur - 1, __x);
	    --this->_M_impl._M_start._M_cur;
	  }
	else
	  _M_push_front_aux(__x);
      }

      /**
       *  @brief  Add data to the end of the %deque.
       *  @param  x  Data to be added.
       *
       *  This is a typical stack operation.  The function creates an
       *  element at the end of the %deque and assigns the given data
       *  to it.  Due to the nature of a %deque this operation can be
       *  done in constant time.
       */
      void
      push_back(const value_type& __x)
      {
	if (this->_M_impl._M_finish._M_cur
	    != this->_M_impl._M_finish._M_last - 1)
	  {
	    this->_M_impl.construct(this->_M_impl._M_finish._M_cur, __x);
	    ++this->_M_impl._M_finish._M_cur;
	  }
	else
	  _M_push_back_aux(__x);
      }

      /**
       *  @brief  Removes first element.
       *
       *  This is a typical stack operation.  It shrinks the %deque by one.
       *
       *  Note that no data is returned, and if the first element's data is
       *  needed, it should be retrieved before pop_front() is called.
       */
      void
      pop_front()
      {
	if (this->_M_impl._M_start._M_cur
	    != this->_M_impl._M_start._M_last - 1)
	  {
	    this->_M_impl.destroy(this->_M_impl._M_start._M_cur);
	    ++this->_M_impl._M_start._M_cur;
	  }
	else
	  _M_pop_front_aux();
      }

      /**
       *  @brief  Removes last element.
       *
       *  This is a typical stack operation.  It shrinks the %deque by one.
       *
       *  Note that no data is returned, and if the last element's data is
       *  needed, it should be retrieved before pop_back() is called.
       */
      void
      pop_back()
      {
	if (this->_M_impl._M_finish._M_cur
	    != this->_M_impl._M_finish._M_first)
	  {
	    --this->_M_impl._M_finish._M_cur;
	    this->_M_impl.destroy(this->_M_impl._M_finish._M_cur);
	  }
	else
	  _M_pop_back_aux();
      }

      /**
       *  @brief  Inserts given value into %deque before specified iterator.
       *  @param  position  An iterator into the %deque.
       *  @param  x  Data to be inserted.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert a copy of the given value before the
       *  specified location.
       */
      iterator
      insert(iterator position, const value_type& __x);

      /**
       *  @brief  Inserts a number of copies of given data into the %deque.
       *  @param  position  An iterator into the %deque.
       *  @param  n  Number of elements to be inserted.
       *  @param  x  Data to be inserted.
       *
       *  This function will insert a specified number of copies of the given
       *  data before the location specified by @a position.
       */
      void
      insert(iterator __position, size_type __n, const value_type& __x)
      { _M_fill_insert(__position, __n, __x); }

      /**
       *  @brief  Inserts a range into the %deque.
       *  @param  position  An iterator into the %deque.
       *  @param  first  An input iterator.
       *  @param  last   An input iterator.
       *
       *  This function will insert copies of the data in the range
       *  [first,last) into the %deque before the location specified
       *  by @a pos.  This is known as "range insert."
       */
      template<typename _InputIterator>
        void
        insert(iterator __position, _InputIterator __first,
	       _InputIterator __last)
        {
	  // Check whether it's an integral type.  If so, it's not an iterator.
	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
	  _M_insert_dispatch(__position, __first, __last, _Integral());
	}

      /**
       *  @brief  Remove element at given position.
       *  @param  position  Iterator pointing to element to be erased.
       *  @return  An iterator pointing to the next element (or end()).
       *
       *  This function will erase the element at the given position and thus
       *  shorten the %deque by one.
       *
       *  The user is cautioned that
       *  this function only erases the element, and that if the element is
       *  itself a pointer, the pointed-to memory is not touched in any way.
       *  Managing the pointer is the user's responsibilty.
       */
      iterator
      erase(iterator __position);