// iterator standard header
#ifndef _ITERATOR_
#define _ITERATOR_
#include <utility>

#ifdef  _MSC_VER
#pragma pack(push,8)
#endif  /* _MSC_VER */
_STD_BEGIN
		// TEMPLATE CLASS reverse_bidirectional_iterator
template<class _BI,
	class _Ty,
	class _Rt = _Ty&,
	class _Pt = _Ty *,
	class _D = ptrdiff_t>
	class reverse_bidirectional_iterator
		: public _Bidit<_Ty, _D> {
public:
	typedef reverse_bidirectional_iterator<_BI,
		_Ty, _Rt, _Pt, _D> _Myt;
	typedef _BI iter_type;
	typedef _Rt reference_type;
	typedef _Pt pointer_type;
	reverse_bidirectional_iterator()
		{}
	explicit reverse_bidirectional_iterator(_BI _X)
		: current(_X) {}
	_BI base() const
		{return (current); }
	_Rt operator*() const
		{_BI _Tmp = current;
		return (*--_Tmp); }
	_Pt operator->() const
		{return (&**this); }
	_Myt& operator++()
		{--current;
		return (*this); }
	_Myt operator++(int)
		{_Myt _Tmp = *this;
		--current;
		return (_Tmp); }
	_Myt& operator--()
		{++current;
		return (*this); }
	_Myt operator--(int)
		{_Myt _Tmp = *this;
		++current;
		return (_Tmp); }
protected:
	_BI current;
	};
template<class _BI, class _Ty, class _Rt, class _Pt,
	class _D> inline
	bool operator==(const reverse_bidirectional_iterator<_BI,
			_Ty, _Rt, _Pt, _D>& _X,
		const reverse_bidirectional_iterator<_BI,
			_Ty, _Rt, _Pt, _D>& _Y)
	{return (_X.base() == _Y.base()); }
template<class _BI, class _Ty, class _Rt, class _Pt,
	class _D> inline
	bool operator!=(const reverse_bidirectional_iterator<_BI,
			_Ty, _Rt, _Pt, _D>& _X,
		const reverse_bidirectional_iterator<_BI,
			_Ty, _Rt, _Pt, _D>& _Y)
	{return (!(_X == _Y)); }
		// TEMPLATE CLASS back_insert_iterator
template<class _C>
	class back_insert_iterator
		: public iterator<output_iterator_tag, void, void> {
public:
	typedef _C container_type;
	typedef _C::value_type value_type;
	explicit back_insert_iterator(_C& _X)
		: container(_X) {}
	back_insert_iterator<_C>& operator=(
		const value_type& _V)
		{container.push_back(_V);
		return (*this); }
	back_insert_iterator<_C>& operator*()
		{return (*this); }
	back_insert_iterator<_C>& operator++()
		{return (*this); }
	back_insert_iterator<_C> operator++(int)
		{return (*this); }
protected:
	_C& container;
	};
template<class _C> inline
	back_insert_iterator<_C> back_inserter(_C& _X)
	{return (back_insert_iterator<_C>(_X)); }
		// TEMPLATE CLASS front_insert_iterator
template<class _C>
	class front_insert_iterator
		: public iterator<output_iterator_tag, void, void> {
public:
	typedef _C container_type;
	typedef _C::value_type value_type;
	explicit front_insert_iterator(_C& _X)
		: container(_X) {}
	front_insert_iterator<_C>& operator=(
		const value_type& _V)
		{container.push_front(_V);
		return (*this); }
	front_insert_iterator<_C>& operator*()
		{return (*this); }
	front_insert_iterator<_C>& operator++()
		{return (*this); }
	front_insert_iterator<_C> operator++(int)
		{return (*this); }
protected:
	_C& container;
	};
template<class _C> inline
	front_insert_iterator<_C> front_inserter(_C& _X)
	{return (front_insert_iterator<_C>(_X)); }
		// TEMPLATE CLASS insert_iterator
template<class _C>
	class insert_iterator
		: public iterator<output_iterator_tag, void, void> {
public:
	typedef _C container_type;
	typedef _C::value_type value_type;
	insert_iterator(_C& _X, _C::iterator _I)
		: container(_X), iter(_I) {}
	insert_iterator<_C>& operator=(
		const value_type& _V)
		{iter = container.insert(iter, _V);
		++iter;
		return (*this); }
	insert_iterator<_C>& operator*()
		{return (*this); }
	insert_iterator<_C>& operator++()
		{return (*this); }
	insert_iterator<_C>& operator++(int)
		{return (*this); }
protected:
	_C& container;
	_C::iterator iter;
	};
template<class _C, class _XI> inline
	insert_iterator<_C> inserter(_C& _X, _XI _I)
	{return (insert_iterator<_C>(_X, _C::iterator(_I))); }
		// TEMPLATE CLASS istream_iterator
template<class _U, class _E = char,
	class _Tr = char_traits<_E> >
	class istream_iterator
		: public iterator<input_iterator_tag, _U, ptrdiff_t> {
public:
	typedef _E char_type;
	typedef _Tr traits_type;
	typedef basic_istream<_E, _Tr> istream_type;
	istream_iterator()
		: _Istr(0) {}
	istream_iterator(istream_type& _I)
		: _Istr(&_I) {_Getval(); }
	const _U& operator*() const
		{return (_Val); }
	const _U *operator->() const
		{return (&**this); }
	istream_iterator<_U, _E, _Tr>& operator++()
		{_Getval();
		return (*this); }
	istream_iterator<_U, _E, _Tr> operator++(int)
		{istream_iterator<_U, _E, _Tr> _Tmp = *this;
		_Getval();
		return (_Tmp); }
	bool _Equal(const istream_iterator<_U, _E, _Tr>& _X) const
		{return (_Istr == _X._Istr); }
protected:
	void _Getval()
		{if (_Istr != 0 && !(*_Istr >> _Val))
			_Istr = 0; }
	istream_type *_Istr;
	_U _Val;
	};
template<class _U, class _E, class _Tr> inline
	bool operator==(const istream_iterator<_U, _E, _Tr>& _X,
		const istream_iterator<_U, _E, _Tr>& _Y)
	{return (_X._Equal(_Y)); }
template<class _U, class _E, class _Tr> inline
	bool operator!=(const istream_iterator<_U, _E, _Tr>& _X,
		const istream_iterator<_U, _E, _Tr>& _Y)
	{return (!(_X == _Y)); }
		// TEMPLATE CLASS ostream_iterator
template<class _U, class _E = char,
	class _Tr = char_traits<_E> >
	class ostream_iterator
		: public iterator<output_iterator_tag, void, void> {
public:
	typedef _U value_type;
	typedef _E char_type;
	typedef _Tr traits_type;
	typedef basic_ostream<_E, _Tr> ostream_type;
	ostream_iterator(ostream_type& _O,
		const _E *_D = 0)
		: _Ostr(&_O), _Delim(_D) {}
	ostream_iterator<_U, _E, _Tr>& operator=(const _U& _X)
		{*_Ostr << _X;
		if (_Delim != 0)
			*_Ostr << _Delim;
		return (*this); }
	ostream_iterator<_U, _E, _Tr>& operator*()
		{return (*this); }
	ostream_iterator<_U, _E, _Tr>& operator++()
		{return (*this); }
	ostream_iterator<_U, _E, _Tr> operator++(int)
		{return (*this); }
protected:
	const _E *_Delim;
	ostream_type *_Ostr;
	};
		// TEMPLATE FUNCTION _Val_type
template<class _C, class _Ty, class _D> inline
	_Ty *_Val_type(const iterator<_C, _Ty, _D>&)
	{return ((_Ty *)0); }
template<class _Ty> inline
	_Ty *_Val_type(const _Ty *)
	{return ((_Ty *)0); }
		// TEMPLATE FUNCTION advance
template<class _II, class _D> inline
	void advance(_II& _I, _D _N)
	{_Advance(_I, _N, _Iter_cat(_I)); }
template<class _II, class _D> inline
	void _Advance(_II& _I, _D _N, input_iterator_tag)
	{for (; 0 < _N; --_N)
		++_I; }
template<class _FI, class _D> inline
	void _Advance(_FI& _I, _D _N, forward_iterator_tag)
	{for (; 0 < _N; --_N)
		++_I; }
template<class _BI, class _D> inline
	void _Advance(_BI& _I, _D _N, bidirectional_iterator_tag)
	{for (; 0 < _N; --_N)
		++_I;
	for (; _N < 0; ++_N)
		--_I; }
template<class _RI, class _D> inline
	void _Advance(_RI& _I, _D _N, random_access_iterator_tag)
	{_I += _N; }
		// TEMPLATE FUNCTION _Dist_type
template<class _C, class _Ty, class _D> inline
	_D *_Dist_type(const iterator<_C, _Ty, _D>&)
	{return ((_D *)0); }
template<class _Ty> inline
	ptrdiff_t *_Dist_type(const _Ty *)
	{return ((ptrdiff_t *)0); }
_STD_END
#ifdef  _MSC_VER
#pragma pack(pop)
#endif  /* _MSC_VER */

#endif /* _ITERATOR_ */

/*
 * Copyright (c) 1995 by P.J. Plauger.  ALL RIGHTS RESERVED. 
 * Consult your license regarding permissions and restrictions.
 */

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