stl_vector.h

gcc3.2.1源代码

// Vector implementation -*- C++ -*-

// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this  software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file stl_vector.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef __GLIBCPP_INTERNAL_VECTOR_H
#define __GLIBCPP_INTERNAL_VECTOR_H

#include <bits/stl_iterator_base_funcs.h>
#include <bits/functexcept.h>
#include <bits/concept_check.h>

namespace std
{

// The vector base class serves two purposes.  First, its constructor
// and destructor allocate (but don't initialize) storage.  This makes
// exception safety easier.  Second, the base class encapsulates all of
// the differences between SGI-style allocators and standard-conforming
// allocators.

// Base class for ordinary allocators.
template <class _Tp, class _Allocator, bool _IsStatic>
class _Vector_alloc_base {
public:
  typedef typename _Alloc_traits<_Tp, _Allocator>::allocator_type
          allocator_type;
  allocator_type get_allocator() const { return _M_data_allocator; }

  _Vector_alloc_base(const allocator_type& __a)
    : _M_data_allocator(__a), _M_start(0), _M_finish(0), _M_end_of_storage(0)
  {}

protected:
  allocator_type _M_data_allocator;
  _Tp* _M_start;
  _Tp* _M_finish;
  _Tp* _M_end_of_storage;

  _Tp* _M_allocate(size_t __n)
    { return _M_data_allocator.allocate(__n); }
  void _M_deallocate(_Tp* __p, size_t __n)
    { if (__p) _M_data_allocator.deallocate(__p, __n); }
};

// Specialization for allocators that have the property that we don't
// actually have to store an allocator object.
template <class _Tp, class _Allocator>
class _Vector_alloc_base<_Tp, _Allocator, true> {
public:
  typedef typename _Alloc_traits<_Tp, _Allocator>::allocator_type
          allocator_type;
  allocator_type get_allocator() const { return allocator_type(); }

  _Vector_alloc_base(const allocator_type&)
    : _M_start(0), _M_finish(0), _M_end_of_storage(0)
  {}

protected:
  _Tp* _M_start;
  _Tp* _M_finish;
  _Tp* _M_end_of_storage;

  typedef typename _Alloc_traits<_Tp, _Allocator>::_Alloc_type _Alloc_type;
  _Tp* _M_allocate(size_t __n)
    { return _Alloc_type::allocate(__n); }
  void _M_deallocate(_Tp* __p, size_t __n)
    { _Alloc_type::deallocate(__p, __n);}
};

template <class _Tp, class _Alloc>
struct _Vector_base
  : public _Vector_alloc_base<_Tp, _Alloc,
                              _Alloc_traits<_Tp, _Alloc>::_S_instanceless>
{
  typedef _Vector_alloc_base<_Tp, _Alloc,
                             _Alloc_traits<_Tp, _Alloc>::_S_instanceless>
          _Base;
  typedef typename _Base::allocator_type allocator_type;

  _Vector_base(const allocator_type& __a) : _Base(__a) {}
  _Vector_base(size_t __n, const allocator_type& __a) : _Base(__a) {
    _M_start = _M_allocate(__n);
    _M_finish = _M_start;
    _M_end_of_storage = _M_start + __n;
  }

  ~_Vector_base() { _M_deallocate(_M_start, _M_end_of_storage - _M_start); }
};


/**
 *  @brief  A standard container which offers fixed time access to individual
 *  elements in any order.
 *
 *  @ingroup Containers
 *  @ingroup Sequences
 *
 *  Meets the requirements of a <a href="tables.html#65">container</a>, a
 *  <a href="tables.html#66">reversible container</a>, and a
 *  <a href="tables.html#67">sequence</a>, including the
 *  <a href="tables.html#68">optional sequence requirements</a> with the
 *  %exception of @c push_front and @c pop_front.
 *
 *  In some terminology a vector can be described as a dynamic C-style array,
 *  it offers fast and efficient access to individual elements in any order
 *  and saves the user from worrying about memory and size allocation.
 *  Subscripting ( [] ) access is also provided as with C-style arrays.
*/
template <class _Tp, class _Alloc = allocator<_Tp> >
class vector : protected _Vector_base<_Tp, _Alloc>
{
  // concept requirements
  __glibcpp_class_requires(_Tp, _SGIAssignableConcept)

private:
  typedef _Vector_base<_Tp, _Alloc> _Base;
  typedef vector<_Tp, _Alloc> vector_type;
public:
  typedef _Tp 						value_type;
  typedef value_type* 					pointer;
  typedef const value_type* 				const_pointer;
  typedef __gnu_cxx::__normal_iterator<pointer, vector_type> 	iterator;
  typedef __gnu_cxx::__normal_iterator<const_pointer, vector_type>
                                                        const_iterator;
  typedef value_type& 					reference;
  typedef const value_type& 				const_reference;
  typedef size_t 					size_type;
  typedef ptrdiff_t 					difference_type;

  typedef typename _Base::allocator_type allocator_type;
  allocator_type get_allocator() const { return _Base::get_allocator(); }

  typedef reverse_iterator<const_iterator> const_reverse_iterator;
  typedef reverse_iterator<iterator> reverse_iterator;

protected:
  using _Base::_M_allocate;
  using _Base::_M_deallocate;
  using _Base::_M_start;
  using _Base::_M_finish;
  using _Base::_M_end_of_storage;

protected:
  void _M_insert_aux(iterator __position, const _Tp& __x);
  void _M_insert_aux(iterator __position);

public:
  /**
   *  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()); }

  /**  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(_Tp); }

  /**
   *  Returns the amount of memory that has been alocated for the current
   *  elements (?).
  */
  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  Subscript access to the data contained in the vector.
   *  @param  n  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 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); }

  void _M_range_check(size_type __n) const {
    if (__n >= this->size())
      __throw_out_of_range("vector");
  }

  /**
   *  @brief  Provides access to the data contained in the vector.
   *  @param  n  The element for which data should be accessed.
   *  @return  Read/write reference to data.
   *
   *  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 element for which data should be accessed.
   *  @return  Read-only (constant) reference to data.
   *
   *  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]; }


  explicit vector(const allocator_type& __a = allocator_type())
    : _Base(__a) {}

  vector(size_type __n, const _Tp& __value,
         const allocator_type& __a = allocator_type())
    : _Base(__n, __a)
    { _M_finish = uninitialized_fill_n(_M_start, __n, __value); }

  explicit vector(size_type __n)
    : _Base(__n, allocator_type())
    { _M_finish = uninitialized_fill_n(_M_start, __n, _Tp()); }

  vector(const vector<_Tp, _Alloc>& __x)
    : _Base(__x.size(), __x.get_allocator())
    { _M_finish = uninitialized_copy(__x.begin(), __x.end(), _M_start); }

  // Check whether it's an integral type.  If so, it's not an iterator.
  template <class _InputIterator>
    vector(_InputIterator __first, _InputIterator __last,
           const allocator_type& __a = allocator_type())
	: _Base(__a)
	{
      typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
      _M_initialize_aux(__first, __last, _Integral());
    }

  template <class _Integer>
    void _M_initialize_aux(_Integer __n, _Integer __value, __true_type)
	{
      _M_start = _M_allocate(__n);
      _M_end_of_storage = _M_start + __n;