gcc/libstdc++-v3/include/bits/stl_vector.h

// 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
{
  /// @if maint Primary default version.  @endif
  /**
   *  @if maint
   *  See bits/stl_deque.h's _Deque_alloc_base for an explanation.
   *  @endif
  */
  template <typename _Tp, typename _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); }
  };
  
  /// @if maint Specialization for instanceless allocators.  @endif
  template <typename _Tp, typename _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);}
  };
  
  
  /**
   *  @if maint
   *  See bits/stl_deque.h's _Deque_base for an explanation.
   *  @endif
  */
  template <typename _Tp, typename _Alloc>
    struct _Vector_base
    : public _Vector_alloc_base<_Tp, _Alloc,
                                _Alloc_traits<_Tp, _Alloc>::_S_instanceless>
  {
  public:
    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 ( @c [] ) access is also provided as with C-style arrays.
  */
  template <typename _Tp, typename _Alloc = allocator<_Tp> >
    class vector : protected _Vector_base<_Tp, _Alloc>
  {
    // concept requirements
    __glibcpp_class_requires(_Tp, _SGIAssignableConcept)
  
    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 reverse_iterator<const_iterator>              const_reverse_iterator;
    typedef reverse_iterator<iterator>                    reverse_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;
  
  protected:
    /** @if maint
     *  These two functions and three data members are all from the top-most
     *  base class, which varies depending on the type of %allocator.  They
     *  should be pretty self-explanatory, as %vector uses a simple contiguous 
     *  allocation scheme.
     *  @endif
    */
    using _Base::_M_allocate;
    using _Base::_M_deallocate;
    using _Base::_M_start;
    using _Base::_M_finish;
    using _Base::_M_end_of_storage;
  
  public:
    // [23.2.4.1] construct/copy/destroy
    // (assign() and get_allocator() are also listed in this section)
    /**
     *  @brief  Default constructor creates no elements.
    */
    explicit
    vector(const allocator_type& __a = allocator_type())
      : _Base(__a) {}
  
    /**
     *  @brief  Create a %vector with copies of an exemplar element.
     *  @param  n  The number of elements to initially create.
     *  @param  value  An element to copy.
     * 
     *  This constructor fills the %vector with @a n copies of @a value.
    */
    vector(size_type __n, const value_type& __value,
           const allocator_type& __a = allocator_type())
      : _Base(__n, __a)
      { _M_finish = uninitialized_fill_n(_M_start, __n, __value); }
  
    /**
     *  @brief  Create a %vector with default elements.
     *  @param  n  The number of elements to initially create.
     * 
     *  This constructor fills the %vector with @a n copies of a
     *  default-constructed element.
    */
    explicit
    vector(size_type __n)
      : _Base(__n, allocator_type())
      { _M_finish = uninitialized_fill_n(_M_start, __n, value_type()); }
  
    /**
     *  @brief  %Vector copy constructor.
     *  @param  x  A %vector of identical element and allocator types.
     * 
     *  The newly-created %vector uses a copy of the allocation object used
     *  by @a x.  All the elements of @a x are copied, but any extra memory in
     *  @a x (for fast expansion) will not be copied.
    */
    vector(const vector& __x)
      : _Base(__x.size(), __x.get_allocator())
      { _M_finish = uninitialized_copy(__x.begin(), __x.end(), _M_start); }
  
    /**
     *  @brief  Builds a %vector from a range.
     *  @param  first  An input iterator.
     *  @param  last  An input iterator.
     * 
     *  Create a %vector consisting of copies of the elements from [first,last).
     *
     *  If the iterators are forward, bidirectional, or random-access, then
     *  this will call the elements' copy constructor N times (where N is
     *  distance(first,last)) and do no memory reallocation.  But if only
     *  input iterators are used, then this will do at most 2N calls to the
     *  copy constructor, and logN memory reallocations.
    */
    template <typename _InputIterator>
      vector(_InputIterator __first, _InputIterator __last,
             const allocator_type& __a = allocator_type())
        : _Base(__a)
      {
        // Check whether it's an integral type.  If so, it's not an iterator.
        typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
        _M_initialize_dispatch(__first, __last, _Integral());
      }
  
    /**
     *  The dtor only erases the elements, and note that if the elements
     *  themselves are pointers, the pointed-to memory is not touched in any
     *  way.  Managing the pointer is the user's responsibilty.
    */
    ~vector() { _Destroy(_M_start, _M_finish); }
  
    /**
     *  @brief  %Vector assignment operator.
     *  @param  x  A %vector of identical element and allocator types.
     * 
     *  All the elements of @a x are copied, but any extra memory in @a x (for
     *  fast expansion) will not be copied.  Unlike the copy constructor, the
     *  allocator object is not copied.
    */
    vector&
    operator=(const vector& __x);
  
    /**
     *  @brief  Assigns a given value to a %vector.
     *  @param  n  Number of elements to be assigned.
     *  @param  val  Value to be assigned.
     *
     *  This function fills a %vector with @a n copies of the given value.
     *  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.
    */
    void
    assign(size_type __n, const value_type& __val) { _M_fill_assign(__n, __val); }
  
    /**
     *  @brief  Assigns a range to a %vector.
     *  @param  first  An input iterator.
     *  @param  last   An input iterator.
     *
     *  This function fills a %vector with copies of the elements in the
     *  range [first,last).
     *
     *  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 the given data
     *  before the location specified by @a position.
     *
     *  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.
    */
    void
    insert (iterator __pos, size_type __n, const value_type& __x)
    { _M_fill_insert(__pos, __n, __x); }
  
    /**
     *  @brief  Inserts a range into the %vector.
     *  @param  pos  An iterator into the %vector.
     *  @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 %vector before the location specified by @a pos.
     *
     *  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.
    */
    template<typename _InputIterator>
      void
      insert(iterator __pos, _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_insert_dispatch(__pos, __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 %vector by one.
     *
     *  Note This operation could be expensive and if it is frequently used the
     *  user should consider using std::list.  The user is also 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);
  
    /**
     *  @brief  Remove a range of elements.
     *  @param  first  Iterator pointing to the first element to be erased.
     *  @param  last  Iterator pointing to one past the last element to be
     *                erased.
     *  @return  An iterator pointing to the element pointed to by @a last
     *           prior to erasing (or end()).
     *
     *  This function will erase the elements in the range [first,last) and
     *  shorten the %vector accordingly.
     *
     *  Note This operation could be expensive and if it is frequently used the
     *  user should consider using std::list.  The user is also cautioned that
     *  this function only erases the elements, and that if the elements
     *  themselves are pointers, the pointed-to memory is not touched in any
     *  way.  Managing the pointer is the user's responsibilty.
    */
    iterator
    erase(iterator __first, iterator __last);
  
    /**
     *  @brief  Swaps data with another %vector.
     *  @param  x  A %vector of the same element and allocator types.
     *
     *  This exchanges the elements between two vectors in constant time.
     *  (Three pointers, so it should be quite fast.)
     *  Note that the global std::swap() function is specialized such that
     *  std::swap(v1,v2) will feed to this function.
    */
    void
    swap(vector& __x)
    {
      std::swap(_M_start, __x._M_start);
      std::swap(_M_finish, __x._M_finish);
      std::swap(_M_end_of_storage, __x._M_end_of_storage);
    }
  
    /**
     *  Erases all the elements.  Note that this function only erases the
     *  elements, and that if the elements themselves are pointers, the
     *  pointed-to memory is not touched in any way.  Managing the pointer is
     *  the user's responsibilty.
    */
    void
    clear() { erase(begin(), end()); }
  
  protected:
    /**
     *  @if maint
     *  Memory expansion handler.  Uses the member allocation function to
     *  obtain @a n bytes of memory, and then copies [first,last) into it.
     *  @endif
    */
    template <typename _ForwardIterator>
    pointer
      _M_allocate_and_copy(size_type __n,
                           _ForwardIterator __first, _ForwardIterator __last)
    {
      pointer __result = _M_allocate(__n);
      try
        {
          uninitialized_copy(__first, __last, __result);
          return __result;
        }
      catch(...)
        {
  	_M_deallocate(__result, __n);
  	__throw_exception_again;
        }
    }
  
  
    // Internal constructor functions follow.
  
    // called by the range constructor to implement [23.1.1]/9
    template<typename _Integer>
      void
      _M_initialize_dispatch(_Integer __n, _Integer __value, __true_type)
      {
        _M_start = _M_allocate(__n);
        _M_end_of_storage = _M_start + __n;
        _M_finish = uninitialized_fill_n(_M_start, __n, __value);
      }
  
    // called by the range constructor to implement [23.1.1]/9
    template<typename _InputIter>
      void
      _M_initialize_dispatch(_InputIter __first, _InputIter __last,
	                     __false_type)
      {
        typedef typename iterator_traits<_InputIter>::iterator_category
                         _IterCategory;
        _M_range_initialize(__first, __last, _IterCategory());
      }
  
    // called by the second initialize_dispatch above
    template <typename _InputIterator>
    void
      _M_range_initialize(_InputIterator __first,
                          _InputIterator __last, input_iterator_tag)
    {
      for ( ; __first != __last; ++__first)
        push_back(*__first);
    }
  
    // called by the second initialize_dispatch above
    template <typename _ForwardIterator>
    void _M_range_initialize(_ForwardIterator __first,
                             _ForwardIterator __last, forward_iterator_tag)
    {
      size_type __n = distance(__first, __last);
      _M_start = _M_allocate(__n);
      _M_end_of_storage = _M_start + __n;
      _M_finish = uninitialized_copy(__first, __last, _M_start);
    }
  
  
    // Internal assign functions follow.  The *_aux functions do the actual
    // assignment work for the range versions.
  
    // called by the range assign to implement [23.1.1]/9
    template<typename _Integer>
      void
       _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
       {
         _M_fill_assign(static_cast<size_type>(__n),
                        static_cast<value_type>(__val));
       }
  
    // called by the range assign to implement [23.1.1]/9
    template<typename _InputIter>
      void
      _M_assign_dispatch(_InputIter __first, _InputIter __last, __false_type)
      {
        typedef typename iterator_traits<_InputIter>::iterator_category
                         _IterCategory;
        _M_assign_aux(__first, __last, _IterCategory());
      }
  
    // called by the second assign_dispatch above
    template <typename _InputIterator>
      void 
      _M_assign_aux(_InputIterator __first, _InputIterator __last,
  		  input_iterator_tag);
  
    // called by the second assign_dispatch above
    template <typename _ForwardIterator>
      void 
      _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last,
  		  forward_iterator_tag);
  
    // Called by assign(n,t), and the range assign when it turns out to be the
    // same thing.
    void
    _M_fill_assign(size_type __n, const value_type& __val);
  
  
    // Internal insert functions follow.
  
    // called by the range insert to implement [23.1.1]/9
    template<typename _Integer>
      void
      _M_insert_dispatch(iterator __pos, _Integer __n, _Integer __val,
                         __true_type)
      {
        _M_fill_insert(__pos, static_cast<size_type>(__n),
                              static_cast<value_type>(__val));
      }
  
    // called by the range insert to implement [23.1.1]/9
    template<typename _InputIterator>
      void
      _M_insert_dispatch(iterator __pos, _InputIterator __first,
                         _InputIterator __last, __false_type)
      {
        typedef typename iterator_traits<_InputIterator>::iterator_category
                         _IterCategory;
        _M_range_insert(__pos, __first, __last, _IterCategory());
      }
  
    // called by the second insert_dispatch above
    template <typename _InputIterator>
      void
      _M_range_insert(iterator __pos,
                      _InputIterator __first, _InputIterator __last,
                      input_iterator_tag);
  
    // called by the second insert_dispatch above
    template <typename _ForwardIterator>
      void
      _M_range_insert(iterator __pos,
                      _ForwardIterator __first, _ForwardIterator __last,
                      forward_iterator_tag);
  
    // Called by insert(p,n,x), and the range insert when it turns out to be
    // the same thing.
    void
    _M_fill_insert (iterator __pos, size_type __n, const value_type& __x);
  
    // called by insert(p,x)
    void
    _M_insert_aux(iterator __position, const value_type& __x);
  
  #ifdef _GLIBCPP_DEPRECATED
    // unused now (same situation as in deque)
    void _M_insert_aux(iterator __position);
  #endif
  };
  
  
  /**
   *  @brief  Vector equality comparison.
   *  @param  x  A %vector.
   *  @param  y  A %vector of the same type as @a x.
   *  @return  True iff the size and elements of the vectors are equal.
   *
   *  This is an equivalence relation.  It is linear in the size of the
   *  vectors.  Vectors are considered equivalent if their sizes are equal,
   *  and if corresponding elements compare equal.
  */
  template <typename _Tp, typename _Alloc>
    inline bool
    operator==(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    {
      return __x.size() == __y.size() &&
             equal(__x.begin(), __x.end(), __y.begin());
    }
  
  /**
   *  @brief  Vector ordering relation.
   *  @param  x  A %vector.
   *  @param  y  A %vector of the same type as @a x.
   *  @return  True iff @a x is lexographically less than @a y.
   *
   *  This is a total ordering relation.  It is linear in the size of the
   *  vectors.  The elements must be comparable with @c <.
   *
   *  See std::lexographical_compare() for how the determination is made.
  */
  template <typename _Tp, typename _Alloc>
    inline bool
    operator<(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    {
      return lexicographical_compare(__x.begin(), __x.end(),
                                     __y.begin(), __y.end());
    }
  
  /// Based on operator==
  template <typename _Tp, typename _Alloc>
    inline bool
    operator!=(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    { return !(__x == __y); }
  
  /// Based on operator<
  template <typename _Tp, typename _Alloc>
    inline bool
    operator>(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    { return __y < __x; }
  
  /// Based on operator<
  template <typename _Tp, typename _Alloc>
    inline bool
    operator<=(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    { return !(__y < __x); }
  
  /// Based on operator<
  template <typename _Tp, typename _Alloc>
    inline bool
    operator>=(const vector<_Tp,_Alloc>& __x, const vector<_Tp,_Alloc>& __y)
    { return !(__x < __y); }
  
  /// See std::vector::swap().
  template <typename _Tp, typename _Alloc>
    inline void
    swap(vector<_Tp,_Alloc>& __x, vector<_Tp,_Alloc>& __y)
    { __x.swap(__y); }
} // namespace std

#endif /* __GLIBCPP_INTERNAL_VECTOR_H */