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locks; strict;
comment	@# @;


1.1
date	2002.05.28.16.15.57;	author obrien;	state Exp;
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	1.1.1.1;
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1.1.1.1
date	2002.05.28.16.15.57;	author obrien;	state Exp;
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1.1.1.2
date	2002.09.01.20.39.10;	author kan;	state Exp;
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1.1.1.3
date	2004.07.28.03.12.05;	author kan;	state Exp;
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date	2007.05.19.01.22.05;	author kan;	state Exp;
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1.1.1.4.30.1
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1.1.1.4.30.2
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desc
@@


1.1
log
@Initial revision
@
text
@// Singly-linked list 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) 1997
 * 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 ext/slist
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset).  You should only
 *  include this header if you are using GCC 3 or later.
 */

#ifndef __SGI_STL_INTERNAL_SLIST_H
#define __SGI_STL_INTERNAL_SLIST_H

#include <bits/stl_algobase.h>
#include <bits/stl_alloc.h>
#include <bits/stl_construct.h>
#include <bits/stl_uninitialized.h>
#include <bits/concept_check.h>

namespace __gnu_cxx
{ 
using std::size_t;
using std::ptrdiff_t;
using std::_Alloc_traits;
using std::_Construct;
using std::_Destroy;
using std::allocator;

struct _Slist_node_base
{
  _Slist_node_base* _M_next;
};

inline _Slist_node_base*
__slist_make_link(_Slist_node_base* __prev_node,
                  _Slist_node_base* __new_node)
{
  __new_node->_M_next = __prev_node->_M_next;
  __prev_node->_M_next = __new_node;
  return __new_node;
}

inline _Slist_node_base* 
__slist_previous(_Slist_node_base* __head,
                 const _Slist_node_base* __node)
{
  while (__head && __head->_M_next != __node)
    __head = __head->_M_next;
  return __head;
}

inline const _Slist_node_base* 
__slist_previous(const _Slist_node_base* __head,
                 const _Slist_node_base* __node)
{
  while (__head && __head->_M_next != __node)
    __head = __head->_M_next;
  return __head;
}

inline void __slist_splice_after(_Slist_node_base* __pos,
                                 _Slist_node_base* __before_first,
                                 _Slist_node_base* __before_last)
{
  if (__pos != __before_first && __pos != __before_last) {
    _Slist_node_base* __first = __before_first->_M_next;
    _Slist_node_base* __after = __pos->_M_next;
    __before_first->_M_next = __before_last->_M_next;
    __pos->_M_next = __first;
    __before_last->_M_next = __after;
  }
}

inline void
__slist_splice_after(_Slist_node_base* __pos, _Slist_node_base* __head)
{
  _Slist_node_base* __before_last = __slist_previous(__head, 0);
  if (__before_last != __head) {
    _Slist_node_base* __after = __pos->_M_next;
    __pos->_M_next = __head->_M_next;
    __head->_M_next = 0;
    __before_last->_M_next = __after;
  }
}

inline _Slist_node_base* __slist_reverse(_Slist_node_base* __node)
{
  _Slist_node_base* __result = __node;
  __node = __node->_M_next;
  __result->_M_next = 0;
  while(__node) {
    _Slist_node_base* __next = __node->_M_next;
    __node->_M_next = __result;
    __result = __node;
    __node = __next;
  }
  return __result;
}

inline size_t __slist_size(_Slist_node_base* __node)
{
  size_t __result = 0;
  for ( ; __node != 0; __node = __node->_M_next)
    ++__result;
  return __result;
}

template <class _Tp>
struct _Slist_node : public _Slist_node_base
{
  _Tp _M_data;
};

struct _Slist_iterator_base
{
  typedef size_t                    size_type;
  typedef ptrdiff_t                 difference_type;
  typedef std::forward_iterator_tag iterator_category;

  _Slist_node_base* _M_node;

  _Slist_iterator_base(_Slist_node_base* __x) : _M_node(__x) {}
  void _M_incr() { _M_node = _M_node->_M_next; }

  bool operator==(const _Slist_iterator_base& __x) const {
    return _M_node == __x._M_node;
  }
  bool operator!=(const _Slist_iterator_base& __x) const {
    return _M_node != __x._M_node;
  }
};

template <class _Tp, class _Ref, class _Ptr>
struct _Slist_iterator : public _Slist_iterator_base
{
  typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
  typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
  typedef _Slist_iterator<_Tp, _Ref, _Ptr>             _Self;

  typedef _Tp              value_type;
  typedef _Ptr             pointer;
  typedef _Ref             reference;
  typedef _Slist_node<_Tp> _Node;

  _Slist_iterator(_Node* __x) : _Slist_iterator_base(__x) {}
  _Slist_iterator() : _Slist_iterator_base(0) {}
  _Slist_iterator(const iterator& __x) : _Slist_iterator_base(__x._M_node) {}

  reference operator*() const { return ((_Node*) _M_node)->_M_data; }
  pointer operator->() const { return &(operator*()); }

  _Self& operator++()
  {
    _M_incr();
    return *this;
  }
  _Self operator++(int)
  {
    _Self __tmp = *this;
    _M_incr();
    return __tmp;
  }
};


// Base class that encapsulates details of allocators.  Three cases:
// an ordinary standard-conforming allocator, a standard-conforming
// allocator with no non-static data, and an SGI-style allocator.
// This complexity is necessary only because we're worrying about backward
// compatibility and because we want to avoid wasting storage on an 
// allocator instance if it isn't necessary.

// Base for general standard-conforming allocators.
template <class _Tp, class _Allocator, bool _IsStatic>
class _Slist_alloc_base {
public:
  typedef typename _Alloc_traits<_Tp,_Allocator>::allocator_type
          allocator_type;
  allocator_type get_allocator() const { return _M_node_allocator; }

  _Slist_alloc_base(const allocator_type& __a) : _M_node_allocator(__a) {}

protected:
  _Slist_node<_Tp>* _M_get_node() 
    { return _M_node_allocator.allocate(1); }
  void _M_put_node(_Slist_node<_Tp>* __p) 
    { _M_node_allocator.deallocate(__p, 1); }

protected:
  typename _Alloc_traits<_Slist_node<_Tp>,_Allocator>::allocator_type
           _M_node_allocator;
  _Slist_node_base _M_head;
};

// Specialization for instanceless allocators.
template <class _Tp, class _Allocator>
class _Slist_alloc_base<_Tp,_Allocator, true> {
public:
  typedef typename _Alloc_traits<_Tp,_Allocator>::allocator_type
          allocator_type;
  allocator_type get_allocator() const { return allocator_type(); }

  _Slist_alloc_base(const allocator_type&) {}

protected:
  typedef typename _Alloc_traits<_Slist_node<_Tp>, _Allocator>::_Alloc_type
          _Alloc_type;
  _Slist_node<_Tp>* _M_get_node() { return _Alloc_type::allocate(1); }
  void _M_put_node(_Slist_node<_Tp>* __p) { _Alloc_type::deallocate(__p, 1); }

protected:
  _Slist_node_base _M_head;
};


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

  _Slist_base(const allocator_type& __a)
    : _Base(__a) { this->_M_head._M_next = 0; }
  ~_Slist_base() { _M_erase_after(&this->_M_head, 0); }

protected:

  _Slist_node_base* _M_erase_after(_Slist_node_base* __pos)
  {
    _Slist_node<_Tp>* __next = (_Slist_node<_Tp>*) (__pos->_M_next);
    _Slist_node_base* __next_next = __next->_M_next;
    __pos->_M_next = __next_next;
    _Destroy(&__next->_M_data);
    _M_put_node(__next);
    return __next_next;
  }
  _Slist_node_base* _M_erase_after(_Slist_node_base*, _Slist_node_base*);
};

template <class _Tp, class _Alloc> 
_Slist_node_base*
_Slist_base<_Tp,_Alloc>::_M_erase_after(_Slist_node_base* __before_first,
                                        _Slist_node_base* __last_node) {
  _Slist_node<_Tp>* __cur = (_Slist_node<_Tp>*) (__before_first->_M_next);
  while (__cur != __last_node) {
    _Slist_node<_Tp>* __tmp = __cur;
    __cur = (_Slist_node<_Tp>*) __cur->_M_next;
    _Destroy(&__tmp->_M_data);
    _M_put_node(__tmp);
  }
  __before_first->_M_next = __last_node;
  return __last_node;
}

template <class _Tp, class _Alloc = allocator<_Tp> >
class slist : private _Slist_base<_Tp,_Alloc>
{
  // concept requirements
  __glibcpp_class_requires(_Tp, _SGIAssignableConcept)

private:
  typedef _Slist_base<_Tp,_Alloc> _Base;
public:
  typedef _Tp               value_type;
  typedef value_type*       pointer;
  typedef const value_type* const_pointer;
  typedef value_type&       reference;
  typedef const value_type& const_reference;
  typedef size_t            size_type;
  typedef ptrdiff_t         difference_type;

  typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
  typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;

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

private:
  typedef _Slist_node<_Tp>      _Node;
  typedef _Slist_node_base      _Node_base;
  typedef _Slist_iterator_base  _Iterator_base;

  _Node* _M_create_node(const value_type& __x) {
    _Node* __node = this->_M_get_node();
    try {
      _Construct(&__node->_M_data, __x);
      __node->_M_next = 0;
    }
    catch(...)
      {
	this->_M_put_node(__node);
	__throw_exception_again;
      }
    return __node;
  }
  
  _Node* _M_create_node() {
    _Node* __node = this->_M_get_node();
    try {
      _Construct(&__node->_M_data);
      __node->_M_next = 0;
    }
    catch(...)
      {
	this->_M_put_node(__node);
	__throw_exception_again;
      }
    return __node;
  }

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

  slist(size_type __n, const value_type& __x,
        const allocator_type& __a =  allocator_type()) : _Base(__a)
    { _M_insert_after_fill(&this->_M_head, __n, __x); }

  explicit slist(size_type __n) : _Base(allocator_type())
    { _M_insert_after_fill(&this->_M_head, __n, value_type()); }

  // We don't need any dispatching tricks here, because _M_insert_after_range
  // already does them.
  template <class _InputIterator>
  slist(_InputIterator __first, _InputIterator __last,
        const allocator_type& __a =  allocator_type()) : _Base(__a)
    { _M_insert_after_range(&this->_M_head, __first, __last); }

  slist(const slist& __x) : _Base(__x.get_allocator())
    { _M_insert_after_range(&this->_M_head, __x.begin(), __x.end()); }

  slist& operator= (const slist& __x);

  ~slist() {}

public:
  // assign(), a generalized assignment member function.  Two
  // versions: one that takes a count, and one that takes a range.
  // The range version is a member template, so we dispatch on whether
  // or not the type is an integer.

  void assign(size_type __n, const _Tp& __val)
    { _M_fill_assign(__n, __val); }

  void _M_fill_assign(size_type __n, const _Tp& __val);

  template <class _InputIterator>
  void assign(_InputIterator __first, _InputIterator __last) {
    typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
    _M_assign_dispatch(__first, __last, _Integral());
  }

  template <class _Integer>
  void _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
    { _M_fill_assign((size_type) __n, (_Tp) __val); }

  template <class _InputIterator>
  void _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
                          __false_type);

public:

  iterator begin() { return iterator((_Node*)this->_M_head._M_next); }
  const_iterator begin() const 
    { return const_iterator((_Node*)this->_M_head._M_next);}

  iterator end() { return iterator(0); }
  const_iterator end() const { return const_iterator(0); }

  // Experimental new feature: before_begin() returns a
  // non-dereferenceable iterator that, when incremented, yields
  // begin().  This iterator may be used as the argument to
  // insert_after, erase_after, etc.  Note that even for an empty 
  // slist, before_begin() is not the same iterator as end().  It 
  // is always necessary to increment before_begin() at least once to
  // obtain end().
  iterator before_begin() { return iterator((_Node*) &this->_M_head); }
  const_iterator before_begin() const
    { return const_iterator((_Node*) &this->_M_head); }

  size_type size() const { return __slist_size(this->_M_head._M_next); }
  
  size_type max_size() const { return size_type(-1); }

  bool empty() const { return this->_M_head._M_next == 0; }

  void swap(slist& __x)
    { std::swap(this->_M_head._M_next, __x._M_head._M_next); }

public:

  reference front() { return ((_Node*) this->_M_head._M_next)->_M_data; }
  const_reference front() const 
    { return ((_Node*) this->_M_head._M_next)->_M_data; }
  void push_front(const value_type& __x)   {
    __slist_make_link(&this->_M_head, _M_create_node(__x));
  }
  void push_front() { __slist_make_link(&this->_M_head, _M_create_node()); }
  void pop_front() {
    _Node* __node = (_Node*) this->_M_head._M_next;
    this->_M_head._M_next = __node->_M_next;
    _Destroy(&__node->_M_data);
    this->_M_put_node(__node);
  }

  iterator previous(const_iterator __pos) {
    return iterator((_Node*) __slist_previous(&this->_M_head, __pos._M_node));
  }
  const_iterator previous(const_iterator __pos) const {
    return const_iterator((_Node*) __slist_previous(&this->_M_head,
                                                    __pos._M_node));
  }

private:
  _Node* _M_insert_after(_Node_base* __pos, const value_type& __x) {
    return (_Node*) (__slist_make_link(__pos, _M_create_node(__x)));
  }

  _Node* _M_insert_after(_Node_base* __pos) {
    return (_Node*) (__slist_make_link(__pos, _M_create_node()));
  }

  void _M_insert_after_fill(_Node_base* __pos,
                            size_type __n, const value_type& __x) {
    for (size_type __i = 0; __i < __n; ++__i)
      __pos = __slist_make_link(__pos, _M_create_node(__x));
  }

  // Check whether it's an integral type.  If so, it's not an iterator.
  template <class _InIter>
  void _M_insert_after_range(_Node_base* __pos, 
                             _InIter __first, _InIter __last) {
    typedef typename _Is_integer<_InIter>::_Integral _Integral;
    _M_insert_after_range(__pos, __first, __last, _Integral());
  }

  template <class _Integer>
  void _M_insert_after_range(_Node_base* __pos, _Integer __n, _Integer __x,
                             __true_type) {
    _M_insert_after_fill(__pos, __n, __x);
  }

  template <class _InIter>
  void _M_insert_after_range(_Node_base* __pos,
                             _InIter __first, _InIter __last,
                             __false_type) {
    while (__first != __last) {
      __pos = __slist_make_link(__pos, _M_create_node(*__first));
      ++__first;
    }
  }

public:

  iterator insert_after(iterator __pos, const value_type& __x) {
    return iterator(_M_insert_after(__pos._M_node, __x));
  }

  iterator insert_after(iterator __pos) {
    return insert_after(__pos, value_type());
  }

  void insert_after(iterator __pos, size_type __n, const value_type& __x) {
    _M_insert_after_fill(__pos._M_node, __n, __x);
  }

  // We don't need any dispatching tricks here, because _M_insert_after_range
  // already does them.
  template <class _InIter>
  void insert_after(iterator __pos, _InIter __first, _InIter __last) {
    _M_insert_after_range(__pos._M_node, __first, __last);
  }

  iterator insert(iterator __pos, const value_type& __x) {
    return iterator(_M_insert_after(__slist_previous(&this->_M_head,
                                                     __pos._M_node),
                    __x));
  }

  iterator insert(iterator __pos) {
    return iterator(_M_insert_after(__slist_previous(&this->_M_head,
                                                     __pos._M_node),
                                    value_type()));
  }

  void insert(iterator __pos, size_type __n, const value_type& __x) {
    _M_insert_after_fill(__slist_previous(&this->_M_head, __pos._M_node),
                         __n, __x);
  } 
    
  // We don't need any dispatching tricks here, because _M_insert_after_range
  // already does them.
  template <class _InIter>
  void insert(iterator __pos, _InIter __first, _InIter __last) {
    _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node), 
                          __first, __last);
  }

public:
  iterator erase_after(iterator __pos) {
    return iterator((_Node*) this->_M_erase_after(__pos._M_node));
  }
  iterator erase_after(iterator __before_first, iterator __last) {
    return iterator((_Node*) this->_M_erase_after(__before_first._M_node, 
                                                  __last._M_node));
  } 

  iterator erase(iterator __pos) {
    return (_Node*) this->_M_erase_after(__slist_previous(&this->_M_head, 
                                                          __pos._M_node));
  }
  iterator erase(iterator __first, iterator __last) {
    return (_Node*) this->_M_erase_after(
      __slist_previous(&this->_M_head, __first._M_node), __last._M_node);
  }

  void resize(size_type new_size, const _Tp& __x);
  void resize(size_type new_size) { resize(new_size, _Tp()); }
  void clear() { this->_M_erase_after(&this->_M_head, 0); }

public:
  // Moves the range [__before_first + 1, __before_last + 1) to *this,
  //  inserting it immediately after __pos.  This is constant time.
  void splice_after(iterator __pos, 
                    iterator __before_first, iterator __before_last)
  {
    if (__before_first != __before_last) 
      __slist_splice_after(__pos._M_node, __before_first._M_node, 
                           __before_last._M_node);
  }

  // Moves the element that follows __prev to *this, inserting it immediately
  //  after __pos.  This is constant time.
  void splice_after(iterator __pos, iterator __prev)
  {
    __slist_splice_after(__pos._M_node,
                         __prev._M_node, __prev._M_node->_M_next);
  }


  // Removes all of the elements from the list __x to *this, inserting
  // them immediately after __pos.  __x must not be *this.  Complexity:
  // linear in __x.size().
  void splice_after(iterator __pos, slist& __x)
  {
    __slist_splice_after(__pos._M_node, &__x._M_head);
  }

  // Linear in distance(begin(), __pos), and linear in __x.size().
  void splice(iterator __pos, slist& __x) {
    if (__x._M_head._M_next)
      __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
                           &__x._M_head, __slist_previous(&__x._M_head, 0));
  }

  // Linear in distance(begin(), __pos), and in distance(__x.begin(), __i).
  void splice(iterator __pos, slist& __x, iterator __i) {
    __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
                         __slist_previous(&__x._M_head, __i._M_node),
                         __i._M_node);
  }

  // Linear in distance(begin(), __pos), in distance(__x.begin(), __first),
  // and in distance(__first, __last).
  void splice(iterator __pos, slist& __x, iterator __first, iterator __last)
  {
    if (__first != __last)
      __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
                           __slist_previous(&__x._M_head, __first._M_node),
                           __slist_previous(__first._M_node, __last._M_node));
  }

public:
  void reverse() { 
    if (this->_M_head._M_next)
      this->_M_head._M_next = __slist_reverse(this->_M_head._M_next);
  }

  void remove(const _Tp& __val); 
  void unique(); 
  void merge(slist& __x);
  void sort();     

  template <class _Predicate> 
  void remove_if(_Predicate __pred);

  template <class _BinaryPredicate> 
  void unique(_BinaryPredicate __pred); 

  template <class _StrictWeakOrdering> 
  void merge(slist&, _StrictWeakOrdering);

  template <class _StrictWeakOrdering> 
  void sort(_StrictWeakOrdering __comp); 
};

template <class _Tp, class _Alloc>
slist<_Tp,_Alloc>& slist<_Tp,_Alloc>::operator=(const slist<_Tp,_Alloc>& __x)
{
  if (&__x != this) {
    _Node_base* __p1 = &this->_M_head;
    _Node* __n1 = (_Node*) this->_M_head._M_next;
    const _Node* __n2 = (const _Node*) __x._M_head._M_next;
    while (__n1 && __n2) {
      __n1->_M_data = __n2->_M_data;
      __p1 = __n1;
      __n1 = (_Node*) __n1->_M_next;
      __n2 = (const _Node*) __n2->_M_next;
    }
    if (__n2 == 0)
      this->_M_erase_after(__p1, 0);
    else
      _M_insert_after_range(__p1, const_iterator((_Node*)__n2), 
                                  const_iterator(0));
  }
  return *this;
}

template <class _Tp, class _Alloc>
void slist<_Tp, _Alloc>::_M_fill_assign(size_type __n, const _Tp& __val) {
  _Node_base* __prev = &this->_M_head;
  _Node* __node = (_Node*) this->_M_head._M_next;
  for ( ; __node != 0 && __n > 0 ; --__n) {
    __node->_M_data = __val;
    __prev = __node;
    __node = (_Node*) __node->_M_next;
  }
  if (__n > 0)
    _M_insert_after_fill(__prev, __n, __val);
  else
    this->_M_erase_after(__prev, 0);
}

template <class _Tp, class _Alloc> template <class _InputIter>
void
slist<_Tp, _Alloc>::_M_assign_dispatch(_InputIter __first, _InputIter __last,
                                       __false_type)
{
  _Node_base* __prev = &this->_M_head;
  _Node* __node = (_Node*) this->_M_head._M_next;
  while (__node != 0 && __first != __last) {
    __node->_M_data = *__first;
    __prev = __node;
    __node = (_Node*) __node->_M_next;
    ++__first;
  }
  if (__first != __last)
    _M_insert_after_range(__prev, __first, __last);
  else
    this->_M_erase_after(__prev, 0);
}

template <class _Tp, class _Alloc>
inline bool 
operator==(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2)
{
  typedef typename slist<_Tp,_Alloc>::const_iterator const_iterator;
  const_iterator __end1 = _SL1.end();
  const_iterator __end2 = _SL2.end();

  const_iterator __i1 = _SL1.begin();
  const_iterator __i2 = _SL2.begin();
  while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2) {
    ++__i1;
    ++__i2;
  }
  return __i1 == __end1 && __i2 == __end2;
}


template <class _Tp, class _Alloc>
inline bool
operator<(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2)
{
  return std::lexicographical_compare(_SL1.begin(), _SL1.end(), 
				      _SL2.begin(), _SL2.end());
}

template <class _Tp, class _Alloc>
inline bool 
operator!=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) {
  return !(_SL1 == _SL2);
}

template <class _Tp, class _Alloc>
inline bool 
operator>(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) {
  return _SL2 < _SL1;
}

template <class _Tp, class _Alloc>
inline bool 
operator<=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) {
  return !(_SL2 < _SL1);
}

template <class _Tp, class _Alloc>
inline bool 
operator>=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) {
  return !(_SL1 < _SL2);
}

template <class _Tp, class _Alloc>
inline void swap(slist<_Tp,_Alloc>& __x, slist<_Tp,_Alloc>& __y) {
  __x.swap(__y);
}


template <class _Tp, class _Alloc>
void slist<_Tp,_Alloc>::resize(size_type __len, const _Tp& __x)
{
  _Node_base* __cur = &this->_M_head;
  while (__cur->_M_next != 0 && __len > 0) {
    --__len;
    __cur = __cur->_M_next;
  }
  if (__cur->_M_next) 
    this->_M_erase_after(__cur, 0);
  else
    _M_insert_after_fill(__cur, __len, __x);
}

template <class _Tp, class _Alloc>
void slist<_Tp,_Alloc>::remove(const _Tp& __val)
{
  _Node_base* __cur = &this->_M_head;
  while (__cur && __cur->_M_next) {
    if (((_Node*) __cur->_M_next)->_M_data == __val)
      this->_M_erase_after(__cur);
    else
      __cur = __cur->_M_next;
  }
}

template <class _Tp, class _Alloc> 
void slist<_Tp,_Alloc>::unique()
{
  _Node_base* __cur = this->_M_head._M_next;
  if (__cur) {
    while (__cur->_M_next) {
      if (((_Node*)__cur)->_M_data == 
          ((_Node*)(__cur->_M_next))->_M_data)
        this->_M_erase_after(__cur);
      else
        __cur = __cur->_M_next;
    }
  }
}

template <class _Tp, class _Alloc>
void slist<_Tp,_Alloc>::merge(slist<_Tp,_Alloc>& __x)
{
  _Node_base* __n1 = &this->_M_head;
  while (__n1->_M_next && __x._M_head._M_next) {
    if (((_Node*) __x._M_head._M_next)->_M_data < 
        ((_Node*)       __n1->_M_next)->_M_data) 
      __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
    __n1 = __n1->_M_next;
  }
  if (__x._M_head._M_next) {
    __n1->_M_next = __x._M_head._M_next;
    __x._M_head._M_next = 0;
  }
}

template <class _Tp, class _Alloc>
void slist<_Tp,_Alloc>::sort()
{
  if (this->_M_head._M_next && this->_M_head._M_next->_M_next) {
    slist __carry;
    slist __counter[64];
    int __fill = 0;
    while (!empty()) {
      __slist_splice_after(&__carry._M_head,
                           &this->_M_head, this->_M_head._M_next);
      int __i = 0;
      while (__i < __fill && !__counter[__i].empty()) {
        __counter[__i].merge(__carry);
        __carry.swap(__counter[__i]);
        ++__i;
      }
      __carry.swap(__counter[__i]);
      if (__i == __fill)
        ++__fill;
    }

    for (int __i = 1; __i < __fill; ++__i)
      __counter[__i].merge(__counter[__i-1]);
    this->swap(__counter[__fill-1]);
  }
}

template <class _Tp, class _Alloc> 
template <class _Predicate>
void slist<_Tp,_Alloc>::remove_if(_Predicate __pred)
{
  _Node_base* __cur = &this->_M_head;
  while (__cur->_M_next) {
    if (__pred(((_Node*) __cur->_M_next)->_M_data))
      this->_M_erase_after(__cur);
    else
      __cur = __cur->_M_next;
  }
}

template <class _Tp, class _Alloc> template <class _BinaryPredicate> 
void slist<_Tp,_Alloc>::unique(_BinaryPredicate __pred)
{
  _Node* __cur = (_Node*) this->_M_head._M_next;
  if (__cur) {
    while (__cur->_M_next) {
      if (__pred(((_Node*)__cur)->_M_data, 
                 ((_Node*)(__cur->_M_next))->_M_data))
        this->_M_erase_after(__cur);
      else
        __cur = (_Node*) __cur->_M_next;
    }
  }
}

template <class _Tp, class _Alloc> template <class _StrictWeakOrdering>
void slist<_Tp,_Alloc>::merge(slist<_Tp,_Alloc>& __x,
                              _StrictWeakOrdering __comp)
{
  _Node_base* __n1 = &this->_M_head;
  while (__n1->_M_next && __x._M_head._M_next) {
    if (__comp(((_Node*) __x._M_head._M_next)->_M_data,
               ((_Node*)       __n1->_M_next)->_M_data))
      __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
    __n1 = __n1->_M_next;
  }
  if (__x._M_head._M_next) {
    __n1->_M_next = __x._M_head._M_next;
    __x._M_head._M_next = 0;
  }
}

template <class _Tp, class _Alloc> template <class _StrictWeakOrdering> 
void slist<_Tp,_Alloc>::sort(_StrictWeakOrdering __comp)
{
  if (this->_M_head._M_next && this->_M_head._M_next->_M_next) {
    slist __carry;
    slist __counter[64];
    int __fill = 0;
    while (!empty()) {
      __slist_splice_after(&__carry._M_head,
                           &this->_M_head, this->_M_head._M_next);
      int __i = 0;
      while (__i < __fill && !__counter[__i].empty()) {
        __counter[__i].merge(__carry, __comp);
        __carry.swap(__counter[__i]);
        ++__i;
      }
      __carry.swap(__counter[__i]);
      if (__i == __fill)
        ++__fill;
    }

    for (int __i = 1; __i < __fill; ++__i)
      __counter[__i].merge(__counter[__i-1], __comp);
    this->swap(__counter[__fill-1]);
  }
}

} // namespace __gnu_cxx

namespace std
{
// Specialization of insert_iterator so that insertions will be constant
// time rather than linear time.

template <class _Tp, class _Alloc>
class insert_iterator<__gnu_cxx::slist<_Tp, _Alloc> > {
protected:
  typedef __gnu_cxx::slist<_Tp, _Alloc> _Container;
  _Container* container;
  typename _Container::iterator iter;
public:
  typedef _Container          container_type;
  typedef output_iterator_tag iterator_category;
  typedef void                value_type;
  typedef void                difference_type;
  typedef void                pointer;
  typedef void                reference;

  insert_iterator(_Container& __x, typename _Container::iterator __i) 
    : container(&__x) {
    if (__i == __x.begin())
      iter = __x.before_begin();
    else
      iter = __x.previous(__i);
  }

  insert_iterator<_Container>&
  operator=(const typename _Container::value_type& __value) { 
    iter = container->insert_after(iter, __value);
    return *this;
  }
  insert_iterator<_Container>& operator*() { return *this; }
  insert_iterator<_Container>& operator++() { return *this; }
  insert_iterator<_Container>& operator++(int) { return *this; }
};

} // namespace std

#endif /* __SGI_STL_INTERNAL_SLIST_H */

// Local Variables:
// mode:C++
// End:
@


1.1.1.1
log
@Gcc 3.1.0 pre-release's C++ support bits from the FSF anoncvs repo
on 9-May-2002 15:57:15 EDT.
@
text
@@


1.1.1.2
log
@Gcc 3.2.1-prerelease libf2c bits from the FSF anoncvs repo gcc-3_2-branch on 1-Sep-2002 00:00:01 EDT.
@
text
@a297 5
/**
 *  This is an SGI extension.
 *  @@ingroup SGIextensions
 *  @@doctodo
*/
@


1.1.1.3
log
@Gcc 3.4.2 20040728 C++ support bits.
@
text
@d50 2
a51 2
#ifndef _SLIST
#define _SLIST 1
d54 1
a54 1
#include <bits/allocator.h>
d60 1
a60 1
{
d63 1
d82 1
a82 1
inline _Slist_node_base*
d91 1
a91 1
inline const _Slist_node_base*
d204 51
d257 2
a258 1
  : public _Alloc::template rebind<_Slist_node<_Tp> >::other
d260 4
a263 5
  typedef typename _Alloc::template rebind<_Slist_node<_Tp> >::other _Node_alloc;
  typedef _Alloc allocator_type;
  allocator_type get_allocator() const {
    return *static_cast<const _Node_alloc*>(this);
  }
d266 1
a266 1
    : _Node_alloc(__a) { this->_M_head._M_next = 0; }
a269 1
  _Slist_node_base _M_head;
a270 4
  _Slist_node<_Tp>* _M_get_node() { return _Node_alloc::allocate(1); }
  void _M_put_node(_Slist_node<_Tp>* __p) { _Node_alloc::deallocate(__p, 1); }

protected:
d283 1
a283 1
template <class _Tp, class _Alloc>
d307 1
a307 1
  __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
d344 1
a344 1

d411 1
a411 1
  const_iterator begin() const
d420 2
a421 2
  // insert_after, erase_after, etc.  Note that even for an empty
  // slist, before_begin() is not the same iterator as end().  It
d429 1
a429 1

d440 1
a440 1
  const_reference front() const
d477 4
a480 4
  template <class _InIterator>
  void _M_insert_after_range(_Node_base* __pos,
                             _InIterator __first, _InIterator __last) {
    typedef typename _Is_integer<_InIterator>::_Integral _Integral;
d490 1
a490 1
  template <class _InIterator>
d492 1
a492 1
                             _InIterator __first, _InIterator __last,
d516 2
a517 2
  template <class _InIterator>
  void insert_after(iterator __pos, _InIterator __first, _InIterator __last) {
d536 2
a537 2
  }

d540 3
a542 3
  template <class _InIterator>
  void insert(iterator __pos, _InIterator __first, _InIterator __last) {
    _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node),
d551 1
a551 1
    return iterator((_Node*) this->_M_erase_after(__before_first._M_node,
d553 1
a553 1
  }
d556 1
a556 1
    return (_Node*) this->_M_erase_after(__slist_previous(&this->_M_head,
d571 1
a571 1
  void splice_after(iterator __pos,
d574 2
a575 2
    if (__before_first != __before_last)
      __slist_splice_after(__pos._M_node, __before_first._M_node,
d621 1
a621 1
  void reverse() {
d626 2
a627 2
  void remove(const _Tp& __val);
  void unique();
d629 1
a629 1
  void sort();
d631 1
a631 1
  template <class _Predicate>
d634 2
a635 2
  template <class _BinaryPredicate>
  void unique(_BinaryPredicate __pred);
d637 1
a637 1
  template <class _StrictWeakOrdering>
d640 2
a641 2
  template <class _StrictWeakOrdering>
  void sort(_StrictWeakOrdering __comp);
d660 1
a660 1
      _M_insert_after_range(__p1, const_iterator((_Node*)__n2),
d681 1
a681 1
template <class _Tp, class _Alloc> template <class _InputIterator>
d683 1
a683 1
slist<_Tp, _Alloc>::_M_assign_dispatch(_InputIterator __first, _InputIterator __last,
d701 1
a701 1
inline bool
d722 1
a722 1
  return std::lexicographical_compare(_SL1.begin(), _SL1.end(),
d727 1
a727 1
inline bool
d733 1
a733 1
inline bool
d739 1
a739 1
inline bool
d745 1
a745 1
inline bool
d764 1
a764 1
  if (__cur->_M_next)
d782 1
a782 1
template <class _Tp, class _Alloc>
d788 1
a788 1
      if (((_Node*)__cur)->_M_data ==
d802 2
a803 2
    if (((_Node*) __x._M_head._M_next)->_M_data <
        ((_Node*)       __n1->_M_next)->_M_data)
d840 1
a840 1
template <class _Tp, class _Alloc>
d853 1
a853 1
template <class _Tp, class _Alloc> template <class _BinaryPredicate>
d859 1
a859 1
      if (__pred(((_Node*)__cur)->_M_data,
d885 1
a885 1
template <class _Tp, class _Alloc> template <class _StrictWeakOrdering>
d933 1
a933 1
  insert_iterator(_Container& __x, typename _Container::iterator __i)
d942 1
a942 1
  operator=(const typename _Container::value_type& __value) {
d953 5
a957 1
#endif
@


1.1.1.4
log
@GCC 4.2.0 release C++ standard library and runtime support code.
@
text
@d3 1
a3 1
// Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
d18 1
a18 1
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
d46 2
a47 1
 *  containing extensions from the HP/SGI STL subset). 
d59 78
a136 1
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
d138 32
a169 7
  using std::size_t;
  using std::ptrdiff_t;
  using std::_Construct;
  using std::_Destroy;
  using std::allocator;
  using std::__true_type;
  using std::__false_type;
d171 20
a190 1
  struct _Slist_node_base
d192 4
a195 6
    _Slist_node_base* _M_next;
  };
  
  inline _Slist_node_base*
  __slist_make_link(_Slist_node_base* __prev_node,
		    _Slist_node_base* __new_node)
d197 3
a199 3
    __new_node->_M_next = __prev_node->_M_next;
    __prev_node->_M_next = __new_node;
    return __new_node;
d201 1
d203 8
a210 7
  inline _Slist_node_base*
  __slist_previous(_Slist_node_base* __head,
		   const _Slist_node_base* __node)
  {
    while (__head && __head->_M_next != __node)
      __head = __head->_M_next;
    return __head;
d213 12
a224 3
  inline const _Slist_node_base*
  __slist_previous(const _Slist_node_base* __head,
		   const _Slist_node_base* __node)
d226 6
a231 3
    while (__head && __head->_M_next != __node)
      __head = __head->_M_next;
    return __head;
d233 2
d236 55
a290 6
  inline void
  __slist_splice_after(_Slist_node_base* __pos,
		       _Slist_node_base* __before_first,
		       _Slist_node_base* __before_last)
  {
    if (__pos != __before_first && __pos != __before_last)
d292 2
a293 5
	_Slist_node_base* __first = __before_first->_M_next;
	_Slist_node_base* __after = __pos->_M_next;
	__before_first->_M_next = __before_last->_M_next;
	__pos->_M_next = __first;
	__before_last->_M_next = __after;
d295 1
d298 7
a304 5
  inline void
  __slist_splice_after(_Slist_node_base* __pos, _Slist_node_base* __head)
  {
    _Slist_node_base* __before_last = __slist_previous(__head, 0);
    if (__before_last != __head)
d306 2
a307 4
	_Slist_node_base* __after = __pos->_M_next;
	__pos->_M_next = __head->_M_next;
	__head->_M_next = 0;
	__before_last->_M_next = __after;
d309 1
d312 39
a350 14
  inline _Slist_node_base*
  __slist_reverse(_Slist_node_base* __node)
  {
    _Slist_node_base* __result = __node;
    __node = __node->_M_next;
    __result->_M_next = 0;
    while(__node)
      {
	_Slist_node_base* __next = __node->_M_next;
	__node->_M_next = __result;
	__result = __node;
	__node = __next;
      }
    return __result;
d353 51
a403 7
  inline size_t
  __slist_size(_Slist_node_base* __node)
  {
    size_t __result = 0;
    for (; __node != 0; __node = __node->_M_next)
      ++__result;
    return __result;
d406 7
a412 5
  template <class _Tp>
    struct _Slist_node : public _Slist_node_base
    {
      _Tp _M_data;
    };
d414 4
a417 53
  struct _Slist_iterator_base
  {
    typedef size_t                    size_type;
    typedef ptrdiff_t                 difference_type;
    typedef std::forward_iterator_tag iterator_category;

    _Slist_node_base* _M_node;
    
    _Slist_iterator_base(_Slist_node_base* __x)
    : _M_node(__x) {}

    void
    _M_incr()
    { _M_node = _M_node->_M_next; }

    bool
    operator==(const _Slist_iterator_base& __x) const
    { return _M_node == __x._M_node; }

    bool
    operator!=(const _Slist_iterator_base& __x) const
    { return _M_node != __x._M_node; }
  };

  template <class _Tp, class _Ref, class _Ptr>
    struct _Slist_iterator : public _Slist_iterator_base
    {
      typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
      typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
      typedef _Slist_iterator<_Tp, _Ref, _Ptr>             _Self;

      typedef _Tp              value_type;
      typedef _Ptr             pointer;
      typedef _Ref             reference;
      typedef _Slist_node<_Tp> _Node;

      explicit
      _Slist_iterator(_Node* __x)
      : _Slist_iterator_base(__x) {}

      _Slist_iterator()
      : _Slist_iterator_base(0) {}

      _Slist_iterator(const iterator& __x)
      : _Slist_iterator_base(__x._M_node) {}

      reference
      operator*() const
      { return ((_Node*) _M_node)->_M_data; }

      pointer
      operator->() const
      { return &(operator*()); }
d419 3
a421 6
      _Self&
      operator++()
      {
	_M_incr();
	return *this;
      }
d423 5
a427 8
      _Self
      operator++(int)
      {
	_Self __tmp = *this;
	_M_incr();
	return __tmp;
      }
    };
d429 7
a435 29
  template <class _Tp, class _Alloc>
    struct _Slist_base
    : public _Alloc::template rebind<_Slist_node<_Tp> >::other
    {
      typedef typename _Alloc::template rebind<_Slist_node<_Tp> >::other
        _Node_alloc;
      typedef _Alloc allocator_type;

      allocator_type
      get_allocator() const
      { return *static_cast<const _Node_alloc*>(this); }

      _Slist_base(const allocator_type& __a)
      : _Node_alloc(__a)
      { this->_M_head._M_next = 0; }

      ~_Slist_base()
      { _M_erase_after(&this->_M_head, 0); }

    protected:
      _Slist_node_base _M_head;

      _Slist_node<_Tp>*
      _M_get_node()
      { return _Node_alloc::allocate(1); }
  
      void
      _M_put_node(_Slist_node<_Tp>* __p)
      { _Node_alloc::deallocate(__p, 1); }
d437 5
a441 12
    protected:
      _Slist_node_base* _M_erase_after(_Slist_node_base* __pos)
      {
	_Slist_node<_Tp>* __next = (_Slist_node<_Tp>*) (__pos->_M_next);
	_Slist_node_base* __next_next = __next->_M_next;
	__pos->_M_next = __next_next;
	get_allocator().destroy(&__next->_M_data);
	_M_put_node(__next);
	return __next_next;
      }
      _Slist_node_base* _M_erase_after(_Slist_node_base*, _Slist_node_base*);
    };
d443 7
a449 15
  template <class _Tp, class _Alloc>
    _Slist_node_base*
    _Slist_base<_Tp,_Alloc>::_M_erase_after(_Slist_node_base* __before_first,
					    _Slist_node_base* __last_node)
    {
      _Slist_node<_Tp>* __cur = (_Slist_node<_Tp>*) (__before_first->_M_next);
      while (__cur != __last_node)
	{
	  _Slist_node<_Tp>* __tmp = __cur;
	  __cur = (_Slist_node<_Tp>*) __cur->_M_next;
	  get_allocator().destroy(&__tmp->_M_data);
	  _M_put_node(__tmp);
	}
      __before_first->_M_next = __last_node;
      return __last_node;
d451 1
d453 37
a489 53
  /**
   *  This is an SGI extension.
   *  @@ingroup SGIextensions
   *  @@doctodo
   */
  template <class _Tp, class _Alloc = allocator<_Tp> >
    class slist : private _Slist_base<_Tp,_Alloc>
    {
      // concept requirements
      __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
	
    private:
      typedef _Slist_base<_Tp,_Alloc> _Base;

    public:
      typedef _Tp               value_type;
      typedef value_type*       pointer;
      typedef const value_type* const_pointer;
      typedef value_type&       reference;
      typedef const value_type& const_reference;
      typedef size_t            size_type;
      typedef ptrdiff_t         difference_type;
      
      typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
      typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
      
      typedef typename _Base::allocator_type allocator_type;

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

    private:
      typedef _Slist_node<_Tp>      _Node;
      typedef _Slist_node_base      _Node_base;
      typedef _Slist_iterator_base  _Iterator_base;
      
      _Node*
      _M_create_node(const value_type& __x)
      {
	_Node* __node = this->_M_get_node();
	try
	  {
	    get_allocator().construct(&__node->_M_data, __x);
	    __node->_M_next = 0;
	  }
	catch(...)
	  {
	    this->_M_put_node(__node);
	    __throw_exception_again;
	  }
	return __node;
      }
d491 7
a497 16
      _Node*
      _M_create_node()
      {
	_Node* __node = this->_M_get_node();
	try
	  {
	    get_allocator().construct(&__node->_M_data, value_type());
	    __node->_M_next = 0;
	  }
	catch(...)
	  {
	    this->_M_put_node(__node);
	    __throw_exception_again;
	  }
	return __node;
      }
d499 8
a506 129
    public:
      explicit
      slist(const allocator_type& __a = allocator_type())
      : _Base(__a) {}

      slist(size_type __n, const value_type& __x,
	    const allocator_type& __a =  allocator_type())
      : _Base(__a)
      { _M_insert_after_fill(&this->_M_head, __n, __x); }

      explicit
      slist(size_type __n)
      : _Base(allocator_type())
      { _M_insert_after_fill(&this->_M_head, __n, value_type()); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InputIterator>
        slist(_InputIterator __first, _InputIterator __last,
	      const allocator_type& __a =  allocator_type())
	: _Base(__a)
        { _M_insert_after_range(&this->_M_head, __first, __last); }

      slist(const slist& __x)
      : _Base(__x.get_allocator())
      { _M_insert_after_range(&this->_M_head, __x.begin(), __x.end()); }

      slist&
      operator= (const slist& __x);

      ~slist() {}

    public:
      // assign(), a generalized assignment member function.  Two
      // versions: one that takes a count, and one that takes a range.
      // The range version is a member template, so we dispatch on whether
      // or not the type is an integer.
      
      void
      assign(size_type __n, const _Tp& __val)
      { _M_fill_assign(__n, __val); }

      void
      _M_fill_assign(size_type __n, const _Tp& __val);

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

      template <class _Integer>
      void
      _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
      { _M_fill_assign((size_type) __n, (_Tp) __val); }

      template <class _InputIterator>
      void
      _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
			 __false_type);

    public:

      iterator
      begin()
      { return iterator((_Node*)this->_M_head._M_next); }

      const_iterator
      begin() const
      { return const_iterator((_Node*)this->_M_head._M_next);}

      iterator
      end()
      { return iterator(0); }

      const_iterator
      end() const
      { return const_iterator(0); }

      // Experimental new feature: before_begin() returns a
      // non-dereferenceable iterator that, when incremented, yields
      // begin().  This iterator may be used as the argument to
      // insert_after, erase_after, etc.  Note that even for an empty
      // slist, before_begin() is not the same iterator as end().  It
      // is always necessary to increment before_begin() at least once to
      // obtain end().
      iterator
      before_begin()
      { return iterator((_Node*) &this->_M_head); }

      const_iterator
      before_begin() const
      { return const_iterator((_Node*) &this->_M_head); }

      size_type
      size() const
      { return __slist_size(this->_M_head._M_next); }

      size_type
      max_size() const
      { return size_type(-1); }

      bool
      empty() const
      { return this->_M_head._M_next == 0; }

      void
      swap(slist& __x)
      { std::swap(this->_M_head._M_next, __x._M_head._M_next); }

    public:

      reference
      front()
      { return ((_Node*) this->_M_head._M_next)->_M_data; }

      const_reference
      front() const
      { return ((_Node*) this->_M_head._M_next)->_M_data; }

      void
      push_front(const value_type& __x)
      { __slist_make_link(&this->_M_head, _M_create_node(__x)); }

      void
      push_front()
      { __slist_make_link(&this->_M_head, _M_create_node()); }
d508 8
a515 8
      void
      pop_front()
      {
	_Node* __node = (_Node*) this->_M_head._M_next;
	this->_M_head._M_next = __node->_M_next;
	get_allocator().destroy(&__node->_M_data);
	this->_M_put_node(__node);
      }
d517 14
a530 26
      iterator
      previous(const_iterator __pos)
      { return iterator((_Node*) __slist_previous(&this->_M_head,
						  __pos._M_node)); }

      const_iterator
      previous(const_iterator __pos) const
      { return const_iterator((_Node*) __slist_previous(&this->_M_head,
							__pos._M_node)); }

    private:
      _Node*
      _M_insert_after(_Node_base* __pos, const value_type& __x)
      { return (_Node*) (__slist_make_link(__pos, _M_create_node(__x))); }

      _Node*
      _M_insert_after(_Node_base* __pos)
      { return (_Node*) (__slist_make_link(__pos, _M_create_node())); }

      void
      _M_insert_after_fill(_Node_base* __pos,
			   size_type __n, const value_type& __x)
      {
	for (size_type __i = 0; __i < __n; ++__i)
	  __pos = __slist_make_link(__pos, _M_create_node(__x));
      }
d532 7
a538 85
      // Check whether it's an integral type.  If so, it's not an iterator.
      template <class _InIterator>
        void
        _M_insert_after_range(_Node_base* __pos,
			      _InIterator __first, _InIterator __last)
        {
	  typedef typename std::__is_integer<_InIterator>::__type _Integral;
	  _M_insert_after_range(__pos, __first, __last, _Integral());
	}

      template <class _Integer>
        void
        _M_insert_after_range(_Node_base* __pos, _Integer __n, _Integer __x,
			      __true_type)
        { _M_insert_after_fill(__pos, __n, __x); }

      template <class _InIterator>
        void
        _M_insert_after_range(_Node_base* __pos,
			      _InIterator __first, _InIterator __last,
			      __false_type)
        {
	  while (__first != __last)
	    {
	      __pos = __slist_make_link(__pos, _M_create_node(*__first));
	      ++__first;
	    }
	}

    public:
      iterator
      insert_after(iterator __pos, const value_type& __x)
      { return iterator(_M_insert_after(__pos._M_node, __x)); }

      iterator
      insert_after(iterator __pos)
      { return insert_after(__pos, value_type()); }

      void
      insert_after(iterator __pos, size_type __n, const value_type& __x)
      { _M_insert_after_fill(__pos._M_node, __n, __x); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InIterator>
        void
        insert_after(iterator __pos, _InIterator __first, _InIterator __last)
        { _M_insert_after_range(__pos._M_node, __first, __last); }

      iterator
      insert(iterator __pos, const value_type& __x)
      { return iterator(_M_insert_after(__slist_previous(&this->_M_head,
							 __pos._M_node),
					__x)); }

      iterator
      insert(iterator __pos)
      { return iterator(_M_insert_after(__slist_previous(&this->_M_head,
							 __pos._M_node),
					value_type())); }

      void
      insert(iterator __pos, size_type __n, const value_type& __x)
      { _M_insert_after_fill(__slist_previous(&this->_M_head, __pos._M_node),
			     __n, __x); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InIterator>
        void
        insert(iterator __pos, _InIterator __first, _InIterator __last)
        { _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node),
				__first, __last); }

    public:
      iterator
      erase_after(iterator __pos)
      { return iterator((_Node*) this->_M_erase_after(__pos._M_node)); }

      iterator
      erase_after(iterator __before_first, iterator __last)
      { 
	return iterator((_Node*) this->_M_erase_after(__before_first._M_node,
						      __last._M_node));
      }
a539 6
      iterator
      erase(iterator __pos)
      { 
	return iterator((_Node*) this->_M_erase_after
			(__slist_previous(&this->_M_head, __pos._M_node)));
      }
d541 7
a547 30
      iterator
      erase(iterator __first, iterator __last)
      { 
	return iterator((_Node*) this->_M_erase_after
			(__slist_previous(&this->_M_head, __first._M_node),
			 __last._M_node));
      }
      
      void
      resize(size_type new_size, const _Tp& __x);

      void
      resize(size_type new_size)
      { resize(new_size, _Tp()); }

      void
      clear()
      { this->_M_erase_after(&this->_M_head, 0); }

    public:
      // Moves the range [__before_first + 1, __before_last + 1) to *this,
      //  inserting it immediately after __pos.  This is constant time.
      void
      splice_after(iterator __pos,
		   iterator __before_first, iterator __before_last)
      {
	if (__before_first != __before_last)
	  __slist_splice_after(__pos._M_node, __before_first._M_node,
			       __before_last._M_node);
      }
d549 6
a554 41
      // Moves the element that follows __prev to *this, inserting it
      // immediately after __pos.  This is constant time.
      void
      splice_after(iterator __pos, iterator __prev)
      { __slist_splice_after(__pos._M_node,
			     __prev._M_node, __prev._M_node->_M_next); }

      // Removes all of the elements from the list __x to *this, inserting
      // them immediately after __pos.  __x must not be *this.  Complexity:
      // linear in __x.size().
      void
      splice_after(iterator __pos, slist& __x)
      { __slist_splice_after(__pos._M_node, &__x._M_head); }

      // Linear in distance(begin(), __pos), and linear in __x.size().
      void
      splice(iterator __pos, slist& __x)
      {
	if (__x._M_head._M_next)
	  __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			       &__x._M_head,
			       __slist_previous(&__x._M_head, 0)); }

      // Linear in distance(begin(), __pos), and in distance(__x.begin(), __i).
      void
      splice(iterator __pos, slist& __x, iterator __i)
      { __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			     __slist_previous(&__x._M_head, __i._M_node),
			     __i._M_node); }

      // Linear in distance(begin(), __pos), in distance(__x.begin(), __first),
      // and in distance(__first, __last).
      void
      splice(iterator __pos, slist& __x, iterator __first, iterator __last)
      {
	if (__first != __last)
	  __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			       __slist_previous(&__x._M_head, __first._M_node),
			       __slist_previous(__first._M_node,
						__last._M_node));
      }
d556 6
a561 7
    public:
      void
      reverse()
      {
	if (this->_M_head._M_next)
	  this->_M_head._M_next = __slist_reverse(this->_M_head._M_next);
      }
d563 9
a571 2
      void
      remove(const _Tp& __val);
d573 5
a577 50
      void
      unique();
      
      void
      merge(slist& __x);
      
      void
      sort();

      template <class _Predicate>
        void
        remove_if(_Predicate __pred);

      template <class _BinaryPredicate>
        void
        unique(_BinaryPredicate __pred);

      template <class _StrictWeakOrdering>
        void
        merge(slist&, _StrictWeakOrdering);

      template <class _StrictWeakOrdering>
        void
        sort(_StrictWeakOrdering __comp);
    };

  template <class _Tp, class _Alloc>
    slist<_Tp, _Alloc>&
    slist<_Tp, _Alloc>::operator=(const slist<_Tp, _Alloc>& __x)
    {
      if (&__x != this)
	{
	  _Node_base* __p1 = &this->_M_head;
	  _Node* __n1 = (_Node*) this->_M_head._M_next;
	  const _Node* __n2 = (const _Node*) __x._M_head._M_next;
	  while (__n1 && __n2)
	    {
	      __n1->_M_data = __n2->_M_data;
	      __p1 = __n1;
	      __n1 = (_Node*) __n1->_M_next;
	      __n2 = (const _Node*) __n2->_M_next;
	    }
	  if (__n2 == 0)
	    this->_M_erase_after(__p1, 0);
	  else
	    _M_insert_after_range(__p1, const_iterator((_Node*)__n2),
                                  const_iterator(0));
	}
      return *this;
    }
d579 30
a608 56
  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::_M_fill_assign(size_type __n, const _Tp& __val)
    {
      _Node_base* __prev = &this->_M_head;
      _Node* __node = (_Node*) this->_M_head._M_next;
      for (; __node != 0 && __n > 0; --__n)
	{
	  __node->_M_data = __val;
	  __prev = __node;
	  __node = (_Node*) __node->_M_next;
	}
      if (__n > 0)
	_M_insert_after_fill(__prev, __n, __val);
      else
	this->_M_erase_after(__prev, 0);
    }
  
  template <class _Tp, class _Alloc>
    template <class _InputIterator>
      void
      slist<_Tp, _Alloc>::_M_assign_dispatch(_InputIterator __first,
					     _InputIterator __last,
					     __false_type)
      {
	_Node_base* __prev = &this->_M_head;
	_Node* __node = (_Node*) this->_M_head._M_next;
	while (__node != 0 && __first != __last)
	  {
	    __node->_M_data = *__first;
	    __prev = __node;
	    __node = (_Node*) __node->_M_next;
	    ++__first;
	  }
	if (__first != __last)
	  _M_insert_after_range(__prev, __first, __last);
	else
	  this->_M_erase_after(__prev, 0);
      }
  
  template <class _Tp, class _Alloc>
    inline bool
    operator==(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    {
      typedef typename slist<_Tp,_Alloc>::const_iterator const_iterator;
      const_iterator __end1 = _SL1.end();
      const_iterator __end2 = _SL2.end();
      
      const_iterator __i1 = _SL1.begin();
      const_iterator __i2 = _SL2.begin();
      while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2)
	{
	  ++__i1;
	  ++__i2;
	}
      return __i1 == __end1 && __i2 == __end2;
d610 8
d619 50
a669 46
  template <class _Tp, class _Alloc>
    inline bool
    operator<(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return std::lexicographical_compare(_SL1.begin(), _SL1.end(),
					  _SL2.begin(), _SL2.end()); }

  template <class _Tp, class _Alloc>
    inline bool
    operator!=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL1 == _SL2); }

  template <class _Tp, class _Alloc>
    inline bool
    operator>(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return _SL2 < _SL1; }

  template <class _Tp, class _Alloc>
    inline bool
    operator<=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL2 < _SL1); }

  template <class _Tp, class _Alloc>
    inline bool
    operator>=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL1 < _SL2); }

  template <class _Tp, class _Alloc>
    inline void
    swap(slist<_Tp, _Alloc>& __x, slist<_Tp, _Alloc>& __y)
    { __x.swap(__y); }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::resize(size_type __len, const _Tp& __x)
    {
      _Node_base* __cur = &this->_M_head;
      while (__cur->_M_next != 0 && __len > 0)
	{
	  --__len;
	  __cur = __cur->_M_next;
	}
      if (__cur->_M_next)
	this->_M_erase_after(__cur, 0);
      else
	_M_insert_after_fill(__cur, __len, __x);
    }
d671 63
a733 13
  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::remove(const _Tp& __val)
    { 
      _Node_base* __cur = &this->_M_head;
      while (__cur && __cur->_M_next)
	{
	  if (((_Node*) __cur->_M_next)->_M_data == __val)
	    this->_M_erase_after(__cur);
	  else
	    __cur = __cur->_M_next;
	}
    }
d735 11
a745 16
  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::unique()
    {
      _Node_base* __cur = this->_M_head._M_next;
      if (__cur)
	{
	  while (__cur->_M_next)
	    {
	      if (((_Node*)__cur)->_M_data
		  == ((_Node*)(__cur->_M_next))->_M_data)
		this->_M_erase_after(__cur);
	      else
		__cur = __cur->_M_next;
	    }
	}
d747 2
d750 15
a764 18
  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::merge(slist<_Tp, _Alloc>& __x)
    {
      _Node_base* __n1 = &this->_M_head;
      while (__n1->_M_next && __x._M_head._M_next)
	{
	  if (((_Node*) __x._M_head._M_next)->_M_data
	      < ((_Node*) __n1->_M_next)->_M_data)
	    __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
	  __n1 = __n1->_M_next;
	}
      if (__x._M_head._M_next)
	{
	  __n1->_M_next = __x._M_head._M_next;
	  __x._M_head._M_next = 0;
	}
    }
d766 19
a784 29
  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::sort()
    {
      if (this->_M_head._M_next && this->_M_head._M_next->_M_next)
	{
	  slist __carry;
	  slist __counter[64];
	  int __fill = 0;
	  while (!empty())
	    {
	      __slist_splice_after(&__carry._M_head,
				   &this->_M_head, this->_M_head._M_next);
	      int __i = 0;
	      while (__i < __fill && !__counter[__i].empty())
		{
		  __counter[__i].merge(__carry);
		  __carry.swap(__counter[__i]);
		  ++__i;
		}
	      __carry.swap(__counter[__i]);
	      if (__i == __fill)
		++__fill;
	    }
	  
	  for (int __i = 1; __i < __fill; ++__i)
	    __counter[__i].merge(__counter[__i-1]);
	  this->swap(__counter[__fill-1]);
	}
d787 5
a791 13
  template <class _Tp, class _Alloc>
    template <class _Predicate>
      void slist<_Tp, _Alloc>::remove_if(_Predicate __pred)
      {
	_Node_base* __cur = &this->_M_head;
	while (__cur->_M_next)
	  {
	    if (__pred(((_Node*) __cur->_M_next)->_M_data))
	      this->_M_erase_after(__cur);
	    else
	      __cur = __cur->_M_next;
	  }
      }
d793 12
a804 18
  template <class _Tp, class _Alloc>
    template <class _BinaryPredicate>
      void
      slist<_Tp, _Alloc>::unique(_BinaryPredicate __pred)
      {
	_Node* __cur = (_Node*) this->_M_head._M_next;
	if (__cur)
	  {
	    while (__cur->_M_next)
	      {
		if (__pred(((_Node*)__cur)->_M_data,
			   ((_Node*)(__cur->_M_next))->_M_data))
		  this->_M_erase_after(__cur);
		else
		  __cur = (_Node*) __cur->_M_next;
	      }
	  }
      }
d806 14
a819 20
  template <class _Tp, class _Alloc>
    template <class _StrictWeakOrdering>
      void
      slist<_Tp, _Alloc>::merge(slist<_Tp, _Alloc>& __x,
			       _StrictWeakOrdering __comp)
      {
	_Node_base* __n1 = &this->_M_head;
	while (__n1->_M_next && __x._M_head._M_next)
	  {
	    if (__comp(((_Node*) __x._M_head._M_next)->_M_data,
		       ((_Node*) __n1->_M_next)->_M_data))
	      __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
	    __n1 = __n1->_M_next;
	  }
	if (__x._M_head._M_next)
	  {
	    __n1->_M_next = __x._M_head._M_next;
	    __x._M_head._M_next = 0;
	  }
      }
d821 16
a836 31
  template <class _Tp, class _Alloc>
    template <class _StrictWeakOrdering>
      void
      slist<_Tp, _Alloc>::sort(_StrictWeakOrdering __comp)
      {
	if (this->_M_head._M_next && this->_M_head._M_next->_M_next)
	  {
	    slist __carry;
	    slist __counter[64];
	    int __fill = 0;
	    while (!empty())
	      {
		__slist_splice_after(&__carry._M_head,
				     &this->_M_head, this->_M_head._M_next);
		int __i = 0;
		while (__i < __fill && !__counter[__i].empty())
		  {
		    __counter[__i].merge(__carry, __comp);
		    __carry.swap(__counter[__i]);
		    ++__i;
		  }
		__carry.swap(__counter[__i]);
		if (__i == __fill)
		  ++__fill;
	      }

	    for (int __i = 1; __i < __fill; ++__i)
	      __counter[__i].merge(__counter[__i-1], __comp);
	    this->swap(__counter[__fill-1]);
	  }
      }
d838 20
a857 1
_GLIBCXX_END_NAMESPACE
d859 5
a863 1
_GLIBCXX_BEGIN_NAMESPACE(std)
d865 1
a865 17
  // Specialization of insert_iterator so that insertions will be constant
  // time rather than linear time.
  template <class _Tp, class _Alloc>
    class insert_iterator<__gnu_cxx::slist<_Tp, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::slist<_Tp, _Alloc> _Container;
      _Container* container;
      typename _Container::iterator iter;

    public:
      typedef _Container          container_type;
      typedef output_iterator_tag iterator_category;
      typedef void                value_type;
      typedef void                difference_type;
      typedef void                pointer;
      typedef void                reference;
d867 26
a892 8
      insert_iterator(_Container& __x, typename _Container::iterator __i)
      : container(&__x)
      {
	if (__i == __x.begin())
	  iter = __x.before_begin();
	else
	  iter = __x.previous(__i);
      }
d894 9
a902 19
      insert_iterator<_Container>&
      operator=(const typename _Container::value_type& __value)
      {
	iter = container->insert_after(iter, __value);
	return *this;
      }

      insert_iterator<_Container>&
      operator*()
      { return *this; }

      insert_iterator<_Container>&
      operator++()
      { return *this; }

      insert_iterator<_Container>&
      operator++(int)
      { return *this; }
    };
d904 1
a904 1
_GLIBCXX_END_NAMESPACE
@


1.1.1.4.30.1
log
@file slist was added on branch RELENG_8_4 on 2013-03-28 13:01:35 +0000
@
text
@d1 1081
@


1.1.1.4.30.2
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/248810
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a0 1081
// Singly-linked list implementation -*- C++ -*-

// Copyright (C) 2001, 2002, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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) 1997
 * 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 ext/slist
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset). 
 */

#ifndef _SLIST
#define _SLIST 1

#include <bits/stl_algobase.h>
#include <bits/allocator.h>
#include <bits/stl_construct.h>
#include <bits/stl_uninitialized.h>
#include <bits/concept_check.h>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  using std::size_t;
  using std::ptrdiff_t;
  using std::_Construct;
  using std::_Destroy;
  using std::allocator;
  using std::__true_type;
  using std::__false_type;

  struct _Slist_node_base
  {
    _Slist_node_base* _M_next;
  };
  
  inline _Slist_node_base*
  __slist_make_link(_Slist_node_base* __prev_node,
		    _Slist_node_base* __new_node)
  {
    __new_node->_M_next = __prev_node->_M_next;
    __prev_node->_M_next = __new_node;
    return __new_node;
  }

  inline _Slist_node_base*
  __slist_previous(_Slist_node_base* __head,
		   const _Slist_node_base* __node)
  {
    while (__head && __head->_M_next != __node)
      __head = __head->_M_next;
    return __head;
  }

  inline const _Slist_node_base*
  __slist_previous(const _Slist_node_base* __head,
		   const _Slist_node_base* __node)
  {
    while (__head && __head->_M_next != __node)
      __head = __head->_M_next;
    return __head;
  }

  inline void
  __slist_splice_after(_Slist_node_base* __pos,
		       _Slist_node_base* __before_first,
		       _Slist_node_base* __before_last)
  {
    if (__pos != __before_first && __pos != __before_last)
      {
	_Slist_node_base* __first = __before_first->_M_next;
	_Slist_node_base* __after = __pos->_M_next;
	__before_first->_M_next = __before_last->_M_next;
	__pos->_M_next = __first;
	__before_last->_M_next = __after;
      }
  }

  inline void
  __slist_splice_after(_Slist_node_base* __pos, _Slist_node_base* __head)
  {
    _Slist_node_base* __before_last = __slist_previous(__head, 0);
    if (__before_last != __head)
      {
	_Slist_node_base* __after = __pos->_M_next;
	__pos->_M_next = __head->_M_next;
	__head->_M_next = 0;
	__before_last->_M_next = __after;
      }
  }

  inline _Slist_node_base*
  __slist_reverse(_Slist_node_base* __node)
  {
    _Slist_node_base* __result = __node;
    __node = __node->_M_next;
    __result->_M_next = 0;
    while(__node)
      {
	_Slist_node_base* __next = __node->_M_next;
	__node->_M_next = __result;
	__result = __node;
	__node = __next;
      }
    return __result;
  }

  inline size_t
  __slist_size(_Slist_node_base* __node)
  {
    size_t __result = 0;
    for (; __node != 0; __node = __node->_M_next)
      ++__result;
    return __result;
  }

  template <class _Tp>
    struct _Slist_node : public _Slist_node_base
    {
      _Tp _M_data;
    };

  struct _Slist_iterator_base
  {
    typedef size_t                    size_type;
    typedef ptrdiff_t                 difference_type;
    typedef std::forward_iterator_tag iterator_category;

    _Slist_node_base* _M_node;
    
    _Slist_iterator_base(_Slist_node_base* __x)
    : _M_node(__x) {}

    void
    _M_incr()
    { _M_node = _M_node->_M_next; }

    bool
    operator==(const _Slist_iterator_base& __x) const
    { return _M_node == __x._M_node; }

    bool
    operator!=(const _Slist_iterator_base& __x) const
    { return _M_node != __x._M_node; }
  };

  template <class _Tp, class _Ref, class _Ptr>
    struct _Slist_iterator : public _Slist_iterator_base
    {
      typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
      typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
      typedef _Slist_iterator<_Tp, _Ref, _Ptr>             _Self;

      typedef _Tp              value_type;
      typedef _Ptr             pointer;
      typedef _Ref             reference;
      typedef _Slist_node<_Tp> _Node;

      explicit
      _Slist_iterator(_Node* __x)
      : _Slist_iterator_base(__x) {}

      _Slist_iterator()
      : _Slist_iterator_base(0) {}

      _Slist_iterator(const iterator& __x)
      : _Slist_iterator_base(__x._M_node) {}

      reference
      operator*() const
      { return ((_Node*) _M_node)->_M_data; }

      pointer
      operator->() const
      { return &(operator*()); }

      _Self&
      operator++()
      {
	_M_incr();
	return *this;
      }

      _Self
      operator++(int)
      {
	_Self __tmp = *this;
	_M_incr();
	return __tmp;
      }
    };

  template <class _Tp, class _Alloc>
    struct _Slist_base
    : public _Alloc::template rebind<_Slist_node<_Tp> >::other
    {
      typedef typename _Alloc::template rebind<_Slist_node<_Tp> >::other
        _Node_alloc;
      typedef _Alloc allocator_type;

      allocator_type
      get_allocator() const
      { return *static_cast<const _Node_alloc*>(this); }

      _Slist_base(const allocator_type& __a)
      : _Node_alloc(__a)
      { this->_M_head._M_next = 0; }

      ~_Slist_base()
      { _M_erase_after(&this->_M_head, 0); }

    protected:
      _Slist_node_base _M_head;

      _Slist_node<_Tp>*
      _M_get_node()
      { return _Node_alloc::allocate(1); }
  
      void
      _M_put_node(_Slist_node<_Tp>* __p)
      { _Node_alloc::deallocate(__p, 1); }

    protected:
      _Slist_node_base* _M_erase_after(_Slist_node_base* __pos)
      {
	_Slist_node<_Tp>* __next = (_Slist_node<_Tp>*) (__pos->_M_next);
	_Slist_node_base* __next_next = __next->_M_next;
	__pos->_M_next = __next_next;
	get_allocator().destroy(&__next->_M_data);
	_M_put_node(__next);
	return __next_next;
      }
      _Slist_node_base* _M_erase_after(_Slist_node_base*, _Slist_node_base*);
    };

  template <class _Tp, class _Alloc>
    _Slist_node_base*
    _Slist_base<_Tp,_Alloc>::_M_erase_after(_Slist_node_base* __before_first,
					    _Slist_node_base* __last_node)
    {
      _Slist_node<_Tp>* __cur = (_Slist_node<_Tp>*) (__before_first->_M_next);
      while (__cur != __last_node)
	{
	  _Slist_node<_Tp>* __tmp = __cur;
	  __cur = (_Slist_node<_Tp>*) __cur->_M_next;
	  get_allocator().destroy(&__tmp->_M_data);
	  _M_put_node(__tmp);
	}
      __before_first->_M_next = __last_node;
      return __last_node;
    }

  /**
   *  This is an SGI extension.
   *  @@ingroup SGIextensions
   *  @@doctodo
   */
  template <class _Tp, class _Alloc = allocator<_Tp> >
    class slist : private _Slist_base<_Tp,_Alloc>
    {
      // concept requirements
      __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
	
    private:
      typedef _Slist_base<_Tp,_Alloc> _Base;

    public:
      typedef _Tp               value_type;
      typedef value_type*       pointer;
      typedef const value_type* const_pointer;
      typedef value_type&       reference;
      typedef const value_type& const_reference;
      typedef size_t            size_type;
      typedef ptrdiff_t         difference_type;
      
      typedef _Slist_iterator<_Tp, _Tp&, _Tp*>             iterator;
      typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
      
      typedef typename _Base::allocator_type allocator_type;

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

    private:
      typedef _Slist_node<_Tp>      _Node;
      typedef _Slist_node_base      _Node_base;
      typedef _Slist_iterator_base  _Iterator_base;
      
      _Node*
      _M_create_node(const value_type& __x)
      {
	_Node* __node = this->_M_get_node();
	try
	  {
	    get_allocator().construct(&__node->_M_data, __x);
	    __node->_M_next = 0;
	  }
	catch(...)
	  {
	    this->_M_put_node(__node);
	    __throw_exception_again;
	  }
	return __node;
      }

      _Node*
      _M_create_node()
      {
	_Node* __node = this->_M_get_node();
	try
	  {
	    get_allocator().construct(&__node->_M_data, value_type());
	    __node->_M_next = 0;
	  }
	catch(...)
	  {
	    this->_M_put_node(__node);
	    __throw_exception_again;
	  }
	return __node;
      }

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

      slist(size_type __n, const value_type& __x,
	    const allocator_type& __a =  allocator_type())
      : _Base(__a)
      { _M_insert_after_fill(&this->_M_head, __n, __x); }

      explicit
      slist(size_type __n)
      : _Base(allocator_type())
      { _M_insert_after_fill(&this->_M_head, __n, value_type()); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InputIterator>
        slist(_InputIterator __first, _InputIterator __last,
	      const allocator_type& __a =  allocator_type())
	: _Base(__a)
        { _M_insert_after_range(&this->_M_head, __first, __last); }

      slist(const slist& __x)
      : _Base(__x.get_allocator())
      { _M_insert_after_range(&this->_M_head, __x.begin(), __x.end()); }

      slist&
      operator= (const slist& __x);

      ~slist() {}

    public:
      // assign(), a generalized assignment member function.  Two
      // versions: one that takes a count, and one that takes a range.
      // The range version is a member template, so we dispatch on whether
      // or not the type is an integer.
      
      void
      assign(size_type __n, const _Tp& __val)
      { _M_fill_assign(__n, __val); }

      void
      _M_fill_assign(size_type __n, const _Tp& __val);

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

      template <class _Integer>
      void
      _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
      { _M_fill_assign((size_type) __n, (_Tp) __val); }

      template <class _InputIterator>
      void
      _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
			 __false_type);

    public:

      iterator
      begin()
      { return iterator((_Node*)this->_M_head._M_next); }

      const_iterator
      begin() const
      { return const_iterator((_Node*)this->_M_head._M_next);}

      iterator
      end()
      { return iterator(0); }

      const_iterator
      end() const
      { return const_iterator(0); }

      // Experimental new feature: before_begin() returns a
      // non-dereferenceable iterator that, when incremented, yields
      // begin().  This iterator may be used as the argument to
      // insert_after, erase_after, etc.  Note that even for an empty
      // slist, before_begin() is not the same iterator as end().  It
      // is always necessary to increment before_begin() at least once to
      // obtain end().
      iterator
      before_begin()
      { return iterator((_Node*) &this->_M_head); }

      const_iterator
      before_begin() const
      { return const_iterator((_Node*) &this->_M_head); }

      size_type
      size() const
      { return __slist_size(this->_M_head._M_next); }

      size_type
      max_size() const
      { return size_type(-1); }

      bool
      empty() const
      { return this->_M_head._M_next == 0; }

      void
      swap(slist& __x)
      { std::swap(this->_M_head._M_next, __x._M_head._M_next); }

    public:

      reference
      front()
      { return ((_Node*) this->_M_head._M_next)->_M_data; }

      const_reference
      front() const
      { return ((_Node*) this->_M_head._M_next)->_M_data; }

      void
      push_front(const value_type& __x)
      { __slist_make_link(&this->_M_head, _M_create_node(__x)); }

      void
      push_front()
      { __slist_make_link(&this->_M_head, _M_create_node()); }

      void
      pop_front()
      {
	_Node* __node = (_Node*) this->_M_head._M_next;
	this->_M_head._M_next = __node->_M_next;
	get_allocator().destroy(&__node->_M_data);
	this->_M_put_node(__node);
      }

      iterator
      previous(const_iterator __pos)
      { return iterator((_Node*) __slist_previous(&this->_M_head,
						  __pos._M_node)); }

      const_iterator
      previous(const_iterator __pos) const
      { return const_iterator((_Node*) __slist_previous(&this->_M_head,
							__pos._M_node)); }

    private:
      _Node*
      _M_insert_after(_Node_base* __pos, const value_type& __x)
      { return (_Node*) (__slist_make_link(__pos, _M_create_node(__x))); }

      _Node*
      _M_insert_after(_Node_base* __pos)
      { return (_Node*) (__slist_make_link(__pos, _M_create_node())); }

      void
      _M_insert_after_fill(_Node_base* __pos,
			   size_type __n, const value_type& __x)
      {
	for (size_type __i = 0; __i < __n; ++__i)
	  __pos = __slist_make_link(__pos, _M_create_node(__x));
      }

      // Check whether it's an integral type.  If so, it's not an iterator.
      template <class _InIterator>
        void
        _M_insert_after_range(_Node_base* __pos,
			      _InIterator __first, _InIterator __last)
        {
	  typedef typename std::__is_integer<_InIterator>::__type _Integral;
	  _M_insert_after_range(__pos, __first, __last, _Integral());
	}

      template <class _Integer>
        void
        _M_insert_after_range(_Node_base* __pos, _Integer __n, _Integer __x,
			      __true_type)
        { _M_insert_after_fill(__pos, __n, __x); }

      template <class _InIterator>
        void
        _M_insert_after_range(_Node_base* __pos,
			      _InIterator __first, _InIterator __last,
			      __false_type)
        {
	  while (__first != __last)
	    {
	      __pos = __slist_make_link(__pos, _M_create_node(*__first));
	      ++__first;
	    }
	}

    public:
      iterator
      insert_after(iterator __pos, const value_type& __x)
      { return iterator(_M_insert_after(__pos._M_node, __x)); }

      iterator
      insert_after(iterator __pos)
      { return insert_after(__pos, value_type()); }

      void
      insert_after(iterator __pos, size_type __n, const value_type& __x)
      { _M_insert_after_fill(__pos._M_node, __n, __x); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InIterator>
        void
        insert_after(iterator __pos, _InIterator __first, _InIterator __last)
        { _M_insert_after_range(__pos._M_node, __first, __last); }

      iterator
      insert(iterator __pos, const value_type& __x)
      { return iterator(_M_insert_after(__slist_previous(&this->_M_head,
							 __pos._M_node),
					__x)); }

      iterator
      insert(iterator __pos)
      { return iterator(_M_insert_after(__slist_previous(&this->_M_head,
							 __pos._M_node),
					value_type())); }

      void
      insert(iterator __pos, size_type __n, const value_type& __x)
      { _M_insert_after_fill(__slist_previous(&this->_M_head, __pos._M_node),
			     __n, __x); }

      // We don't need any dispatching tricks here, because
      // _M_insert_after_range already does them.
      template <class _InIterator>
        void
        insert(iterator __pos, _InIterator __first, _InIterator __last)
        { _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node),
				__first, __last); }

    public:
      iterator
      erase_after(iterator __pos)
      { return iterator((_Node*) this->_M_erase_after(__pos._M_node)); }

      iterator
      erase_after(iterator __before_first, iterator __last)
      { 
	return iterator((_Node*) this->_M_erase_after(__before_first._M_node,
						      __last._M_node));
      }

      iterator
      erase(iterator __pos)
      { 
	return iterator((_Node*) this->_M_erase_after
			(__slist_previous(&this->_M_head, __pos._M_node)));
      }

      iterator
      erase(iterator __first, iterator __last)
      { 
	return iterator((_Node*) this->_M_erase_after
			(__slist_previous(&this->_M_head, __first._M_node),
			 __last._M_node));
      }
      
      void
      resize(size_type new_size, const _Tp& __x);

      void
      resize(size_type new_size)
      { resize(new_size, _Tp()); }

      void
      clear()
      { this->_M_erase_after(&this->_M_head, 0); }

    public:
      // Moves the range [__before_first + 1, __before_last + 1) to *this,
      //  inserting it immediately after __pos.  This is constant time.
      void
      splice_after(iterator __pos,
		   iterator __before_first, iterator __before_last)
      {
	if (__before_first != __before_last)
	  __slist_splice_after(__pos._M_node, __before_first._M_node,
			       __before_last._M_node);
      }

      // Moves the element that follows __prev to *this, inserting it
      // immediately after __pos.  This is constant time.
      void
      splice_after(iterator __pos, iterator __prev)
      { __slist_splice_after(__pos._M_node,
			     __prev._M_node, __prev._M_node->_M_next); }

      // Removes all of the elements from the list __x to *this, inserting
      // them immediately after __pos.  __x must not be *this.  Complexity:
      // linear in __x.size().
      void
      splice_after(iterator __pos, slist& __x)
      { __slist_splice_after(__pos._M_node, &__x._M_head); }

      // Linear in distance(begin(), __pos), and linear in __x.size().
      void
      splice(iterator __pos, slist& __x)
      {
	if (__x._M_head._M_next)
	  __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			       &__x._M_head,
			       __slist_previous(&__x._M_head, 0)); }

      // Linear in distance(begin(), __pos), and in distance(__x.begin(), __i).
      void
      splice(iterator __pos, slist& __x, iterator __i)
      { __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			     __slist_previous(&__x._M_head, __i._M_node),
			     __i._M_node); }

      // Linear in distance(begin(), __pos), in distance(__x.begin(), __first),
      // and in distance(__first, __last).
      void
      splice(iterator __pos, slist& __x, iterator __first, iterator __last)
      {
	if (__first != __last)
	  __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node),
			       __slist_previous(&__x._M_head, __first._M_node),
			       __slist_previous(__first._M_node,
						__last._M_node));
      }

    public:
      void
      reverse()
      {
	if (this->_M_head._M_next)
	  this->_M_head._M_next = __slist_reverse(this->_M_head._M_next);
      }

      void
      remove(const _Tp& __val);

      void
      unique();
      
      void
      merge(slist& __x);
      
      void
      sort();

      template <class _Predicate>
        void
        remove_if(_Predicate __pred);

      template <class _BinaryPredicate>
        void
        unique(_BinaryPredicate __pred);

      template <class _StrictWeakOrdering>
        void
        merge(slist&, _StrictWeakOrdering);

      template <class _StrictWeakOrdering>
        void
        sort(_StrictWeakOrdering __comp);
    };

  template <class _Tp, class _Alloc>
    slist<_Tp, _Alloc>&
    slist<_Tp, _Alloc>::operator=(const slist<_Tp, _Alloc>& __x)
    {
      if (&__x != this)
	{
	  _Node_base* __p1 = &this->_M_head;
	  _Node* __n1 = (_Node*) this->_M_head._M_next;
	  const _Node* __n2 = (const _Node*) __x._M_head._M_next;
	  while (__n1 && __n2)
	    {
	      __n1->_M_data = __n2->_M_data;
	      __p1 = __n1;
	      __n1 = (_Node*) __n1->_M_next;
	      __n2 = (const _Node*) __n2->_M_next;
	    }
	  if (__n2 == 0)
	    this->_M_erase_after(__p1, 0);
	  else
	    _M_insert_after_range(__p1, const_iterator((_Node*)__n2),
                                  const_iterator(0));
	}
      return *this;
    }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::_M_fill_assign(size_type __n, const _Tp& __val)
    {
      _Node_base* __prev = &this->_M_head;
      _Node* __node = (_Node*) this->_M_head._M_next;
      for (; __node != 0 && __n > 0; --__n)
	{
	  __node->_M_data = __val;
	  __prev = __node;
	  __node = (_Node*) __node->_M_next;
	}
      if (__n > 0)
	_M_insert_after_fill(__prev, __n, __val);
      else
	this->_M_erase_after(__prev, 0);
    }
  
  template <class _Tp, class _Alloc>
    template <class _InputIterator>
      void
      slist<_Tp, _Alloc>::_M_assign_dispatch(_InputIterator __first,
					     _InputIterator __last,
					     __false_type)
      {
	_Node_base* __prev = &this->_M_head;
	_Node* __node = (_Node*) this->_M_head._M_next;
	while (__node != 0 && __first != __last)
	  {
	    __node->_M_data = *__first;
	    __prev = __node;
	    __node = (_Node*) __node->_M_next;
	    ++__first;
	  }
	if (__first != __last)
	  _M_insert_after_range(__prev, __first, __last);
	else
	  this->_M_erase_after(__prev, 0);
      }
  
  template <class _Tp, class _Alloc>
    inline bool
    operator==(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    {
      typedef typename slist<_Tp,_Alloc>::const_iterator const_iterator;
      const_iterator __end1 = _SL1.end();
      const_iterator __end2 = _SL2.end();
      
      const_iterator __i1 = _SL1.begin();
      const_iterator __i2 = _SL2.begin();
      while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2)
	{
	  ++__i1;
	  ++__i2;
	}
      return __i1 == __end1 && __i2 == __end2;
    }


  template <class _Tp, class _Alloc>
    inline bool
    operator<(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return std::lexicographical_compare(_SL1.begin(), _SL1.end(),
					  _SL2.begin(), _SL2.end()); }

  template <class _Tp, class _Alloc>
    inline bool
    operator!=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL1 == _SL2); }

  template <class _Tp, class _Alloc>
    inline bool
    operator>(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return _SL2 < _SL1; }

  template <class _Tp, class _Alloc>
    inline bool
    operator<=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL2 < _SL1); }

  template <class _Tp, class _Alloc>
    inline bool
    operator>=(const slist<_Tp, _Alloc>& _SL1, const slist<_Tp, _Alloc>& _SL2)
    { return !(_SL1 < _SL2); }

  template <class _Tp, class _Alloc>
    inline void
    swap(slist<_Tp, _Alloc>& __x, slist<_Tp, _Alloc>& __y)
    { __x.swap(__y); }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::resize(size_type __len, const _Tp& __x)
    {
      _Node_base* __cur = &this->_M_head;
      while (__cur->_M_next != 0 && __len > 0)
	{
	  --__len;
	  __cur = __cur->_M_next;
	}
      if (__cur->_M_next)
	this->_M_erase_after(__cur, 0);
      else
	_M_insert_after_fill(__cur, __len, __x);
    }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::remove(const _Tp& __val)
    { 
      _Node_base* __cur = &this->_M_head;
      while (__cur && __cur->_M_next)
	{
	  if (((_Node*) __cur->_M_next)->_M_data == __val)
	    this->_M_erase_after(__cur);
	  else
	    __cur = __cur->_M_next;
	}
    }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::unique()
    {
      _Node_base* __cur = this->_M_head._M_next;
      if (__cur)
	{
	  while (__cur->_M_next)
	    {
	      if (((_Node*)__cur)->_M_data
		  == ((_Node*)(__cur->_M_next))->_M_data)
		this->_M_erase_after(__cur);
	      else
		__cur = __cur->_M_next;
	    }
	}
    }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::merge(slist<_Tp, _Alloc>& __x)
    {
      _Node_base* __n1 = &this->_M_head;
      while (__n1->_M_next && __x._M_head._M_next)
	{
	  if (((_Node*) __x._M_head._M_next)->_M_data
	      < ((_Node*) __n1->_M_next)->_M_data)
	    __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
	  __n1 = __n1->_M_next;
	}
      if (__x._M_head._M_next)
	{
	  __n1->_M_next = __x._M_head._M_next;
	  __x._M_head._M_next = 0;
	}
    }

  template <class _Tp, class _Alloc>
    void
    slist<_Tp, _Alloc>::sort()
    {
      if (this->_M_head._M_next && this->_M_head._M_next->_M_next)
	{
	  slist __carry;
	  slist __counter[64];
	  int __fill = 0;
	  while (!empty())
	    {
	      __slist_splice_after(&__carry._M_head,
				   &this->_M_head, this->_M_head._M_next);
	      int __i = 0;
	      while (__i < __fill && !__counter[__i].empty())
		{
		  __counter[__i].merge(__carry);
		  __carry.swap(__counter[__i]);
		  ++__i;
		}
	      __carry.swap(__counter[__i]);
	      if (__i == __fill)
		++__fill;
	    }
	  
	  for (int __i = 1; __i < __fill; ++__i)
	    __counter[__i].merge(__counter[__i-1]);
	  this->swap(__counter[__fill-1]);
	}
    }

  template <class _Tp, class _Alloc>
    template <class _Predicate>
      void slist<_Tp, _Alloc>::remove_if(_Predicate __pred)
      {
	_Node_base* __cur = &this->_M_head;
	while (__cur->_M_next)
	  {
	    if (__pred(((_Node*) __cur->_M_next)->_M_data))
	      this->_M_erase_after(__cur);
	    else
	      __cur = __cur->_M_next;
	  }
      }

  template <class _Tp, class _Alloc>
    template <class _BinaryPredicate>
      void
      slist<_Tp, _Alloc>::unique(_BinaryPredicate __pred)
      {
	_Node* __cur = (_Node*) this->_M_head._M_next;
	if (__cur)
	  {
	    while (__cur->_M_next)
	      {
		if (__pred(((_Node*)__cur)->_M_data,
			   ((_Node*)(__cur->_M_next))->_M_data))
		  this->_M_erase_after(__cur);
		else
		  __cur = (_Node*) __cur->_M_next;
	      }
	  }
      }

  template <class _Tp, class _Alloc>
    template <class _StrictWeakOrdering>
      void
      slist<_Tp, _Alloc>::merge(slist<_Tp, _Alloc>& __x,
			       _StrictWeakOrdering __comp)
      {
	_Node_base* __n1 = &this->_M_head;
	while (__n1->_M_next && __x._M_head._M_next)
	  {
	    if (__comp(((_Node*) __x._M_head._M_next)->_M_data,
		       ((_Node*) __n1->_M_next)->_M_data))
	      __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next);
	    __n1 = __n1->_M_next;
	  }
	if (__x._M_head._M_next)
	  {
	    __n1->_M_next = __x._M_head._M_next;
	    __x._M_head._M_next = 0;
	  }
      }

  template <class _Tp, class _Alloc>
    template <class _StrictWeakOrdering>
      void
      slist<_Tp, _Alloc>::sort(_StrictWeakOrdering __comp)
      {
	if (this->_M_head._M_next && this->_M_head._M_next->_M_next)
	  {
	    slist __carry;
	    slist __counter[64];
	    int __fill = 0;
	    while (!empty())
	      {
		__slist_splice_after(&__carry._M_head,
				     &this->_M_head, this->_M_head._M_next);
		int __i = 0;
		while (__i < __fill && !__counter[__i].empty())
		  {
		    __counter[__i].merge(__carry, __comp);
		    __carry.swap(__counter[__i]);
		    ++__i;
		  }
		__carry.swap(__counter[__i]);
		if (__i == __fill)
		  ++__fill;
	      }

	    for (int __i = 1; __i < __fill; ++__i)
	      __counter[__i].merge(__counter[__i-1], __comp);
	    this->swap(__counter[__fill-1]);
	  }
      }

_GLIBCXX_END_NAMESPACE

_GLIBCXX_BEGIN_NAMESPACE(std)

  // Specialization of insert_iterator so that insertions will be constant
  // time rather than linear time.
  template <class _Tp, class _Alloc>
    class insert_iterator<__gnu_cxx::slist<_Tp, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::slist<_Tp, _Alloc> _Container;
      _Container* container;
      typename _Container::iterator iter;

    public:
      typedef _Container          container_type;
      typedef output_iterator_tag iterator_category;
      typedef void                value_type;
      typedef void                difference_type;
      typedef void                pointer;
      typedef void                reference;

      insert_iterator(_Container& __x, typename _Container::iterator __i)
      : container(&__x)
      {
	if (__i == __x.begin())
	  iter = __x.before_begin();
	else
	  iter = __x.previous(__i);
      }

      insert_iterator<_Container>&
      operator=(const typename _Container::value_type& __value)
      {
	iter = container->insert_after(iter, __value);
	return *this;
      }

      insert_iterator<_Container>&
      operator*()
      { return *this; }

      insert_iterator<_Container>&
      operator++()
      { return *this; }

      insert_iterator<_Container>&
      operator++(int)
      { return *this; }
    };

_GLIBCXX_END_NAMESPACE

#endif
@


