slist

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        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]);
	  }
      }

} // 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