stl_vector.h

linux下的gcc编译器

       *  Note that the assignment completely changes the %vector and
       *  that the resulting %vector's size is the same as the number
       *  of elements assigned.  Old data may be lost.
       */
      template<typename _InputIterator>
        void
        assign(_InputIterator __first, _InputIterator __last)
        {
	  // Check whether it's an integral type.  If so, it's not an iterator.
	  typedef typename _Is_integer<_InputIterator>::_Integral _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
       *  %vector.  Iteration is done in ordinary element order.
       */
      iterator
      begin() { return iterator (_M_start); }
      
      /**
       *  Returns a read-only (constant) iterator that points to the
       *  first element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      const_iterator
      begin() const { return const_iterator (_M_start); }
      
      /**
       *  Returns a read/write iterator that points one past the last
       *  element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      iterator
      end() { return iterator (_M_finish); }
      
      /**
       *  Returns a read-only (constant) iterator that points one past the last
       *  element in the %vector.  Iteration is done in ordinary element order.
       */
      const_iterator
      end() const { return const_iterator (_M_finish); }
      
      /**
       *  Returns a read/write reverse iterator that points to the
       *  last element in the %vector.  Iteration is done in reverse
       *  element order.
       */
      reverse_iterator
      rbegin() { return reverse_iterator(end()); }
      
      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to the last element in the %vector.  Iteration is done in
       *  reverse element order.
       */
      const_reverse_iterator
      rbegin() const { return const_reverse_iterator(end()); }
      
      /**
       *  Returns a read/write reverse iterator that points to one before the
       *  first element in the %vector.  Iteration is done in reverse element
       *  order.
       */
      reverse_iterator
      rend() { return reverse_iterator(begin()); }
      
      /**
       *  Returns a read-only (constant) reverse iterator that points
       *  to one before the first element in the %vector.  Iteration
       *  is done in reverse element order.
       */
      const_reverse_iterator
      rend() const { return const_reverse_iterator(begin()); }
  
      // [23.2.4.2] capacity
      /**  Returns the number of elements in the %vector.  */
      size_type
      size() const { return size_type(end() - begin()); }
      
      /**  Returns the size() of the largest possible %vector.  */
      size_type
      max_size() const { return size_type(-1) / sizeof(value_type); }
      
      /**
       *  @brief  Resizes the %vector to the specified number of elements.
       *  @param  new_size  Number of elements the %vector should contain.
       *  @param  x  Data with which new elements should be populated.
       *
       *  This function will %resize the %vector to the specified
       *  number of elements.  If the number is smaller than the
       *  %vector's current size the %vector is truncated, otherwise
       *  the %vector is extended and new elements are populated with
       *  given data.
       */
      void
      resize(size_type __new_size, const value_type& __x)
      {
	if (__new_size < size())
	  erase(begin() + __new_size, end());
	else
	  insert(end(), __new_size - size(), __x);
      }
      
      /**
       *  @brief  Resizes the %vector to the specified number of elements.
       *  @param  new_size  Number of elements the %vector should contain.
       *
       *  This function will resize the %vector to the specified
       *  number of elements.  If the number is smaller than the
       *  %vector's current size the %vector is truncated, otherwise
       *  the %vector is extended and new elements are
       *  default-constructed.
       */
      void
      resize(size_type __new_size) { resize(__new_size, value_type()); }
      
      /**
       *  Returns the total number of elements that the %vector can hold before
       *  needing to allocate more memory.
       */
      size_type
      capacity() const
      { return size_type(const_iterator(_M_end_of_storage) - begin()); }
      
      /**
       *  Returns true if the %vector is empty.  (Thus begin() would
       *  equal end().)
       */
      bool
      empty() const { return begin() == end(); }
      
      /**
       *  @brief  Attempt to preallocate enough memory for specified number of
       *          elements.
       *  @param  n  Number of elements required.
       *  @throw  std::length_error  If @a n exceeds @c max_size().
       *
       *  This function attempts to reserve enough memory for the
       *  %vector to hold the specified number of elements.  If the
       *  number requested is more than max_size(), length_error is
       *  thrown.
       *
       *  The advantage of this function is that if optimal code is a
       *  necessity and the user can determine the number of elements
       *  that will be required, the user can reserve the memory in
       *  %advance, and thus prevent a possible reallocation of memory
       *  and copying of %vector data.
       */
      void
      reserve(size_type __n);
      
      // element access
      /**
       *  @brief  Subscript access to the data contained in the %vector.
       *  @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 *(begin() + __n); }
      
      /**
       *  @brief  Subscript access to the data contained in the %vector.
       *  @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 *(begin() + __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("vector [] access out of range");
      }
      
    public:
      /**
       *  @brief  Provides access to the data contained in the %vector.
       *  @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 vector.  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 %vector.
       *  @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 vector.  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 %vector.
       */
      reference
      front() { return *begin(); }
      
      /**
       *  Returns a read-only (constant) reference to the data at the first
       *  element of the %vector.
       */
      const_reference
      front() const { return *begin(); }
      
      /**
       *  Returns a read/write reference to the data at the last element of the
       *  %vector.
       */
      reference
      back() { return *(end() - 1); }
      
      /**
       *  Returns a read-only (constant) reference to the data at the last
       *  element of the %vector.
       */
      const_reference
      back() const { return *(end() - 1); }
  
      // [23.2.4.3] modifiers
      /**
       *  @brief  Add data to the end of the %vector.
       *  @param  x  Data to be added.
       *
       *  This is a typical stack operation.  The function creates an
       *  element at the end of the %vector and assigns the given data
       *  to it.  Due to the nature of a %vector this operation can be
       *  done in constant time if the %vector has preallocated space
       *  available.
       */
      void
      push_back(const value_type& __x)
      {
	if (_M_finish != _M_end_of_storage)
	  {
	    _Construct(_M_finish, __x);
	    ++_M_finish;
	  }
	else
	  _M_insert_aux(end(), __x);
      }
      
      /**
       *  @brief  Removes last element.
       *
       *  This is a typical stack operation. It shrinks the %vector 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()
      {
	--_M_finish;
	_Destroy(_M_finish);
      }
      
      /**
       *  @brief  Inserts given value into %vector before specified iterator.
       *  @param  position  An iterator into the %vector.
       *  @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.  Note that this kind of operation
       *  could be expensive for a %vector and if it is frequently
       *  used the user should consider using std::list.
       */
      iterator
      insert(iterator __position, const value_type& __x);
  
#ifdef _GLIBCPP_DEPRECATED
      /**
       *  @brief  Inserts an element into the %vector.
       *  @param  position  An iterator into the %vector.
       *  @return  An iterator that points to the inserted element.
       *
       *  This function will insert a default-constructed element
       *  before the specified location.  You should consider using
       *  insert(position,value_type()) instead.  Note that this kind
       *  of operation could be expensive for a vector and if it is
       *  frequently used the user should consider using std::list.
       *
       *  @note This was deprecated in 3.2 and will be removed in 3.4.
       *  You must define @c _GLIBCPP_DEPRECATED to make this visible
       *  in 3.2; see c++config.h.
       */
      iterator
      insert(iterator __position)
      { return insert(__position, value_type()); }
#endif
      
      /**
       *  @brief  Inserts a number of copies of given data into the %vector.
       *  @param  position  An iterator into the %vector.
       *  @param  n  Number of elements to be inserted.
       *  @param  x  Data to be inserted.
       *
       *  This function will insert a specified number of copies of