// iterator standard header
#pragma once
#ifndef _ITERATOR_
#define _ITERATOR_
#include <xutility>

#pragma pack(push,8)
#pragma warning(push,3)

_STD_BEGIN

		// TEMPLATE CLASS back_insert_iterator
template<class _Container>
	class back_insert_iterator
		: public _Outit
	{	// wrap pushes to back of container as output iterator
public:
	typedef _Container container_type;
	typedef typename _Container::reference reference;

	explicit back_insert_iterator(_Container& _Cont)
		: container(&_Cont)
		{	// construct with container
		}

	back_insert_iterator<_Container>& operator=(
		typename _Container::const_reference _Val)
		{	// push value into container
		container->push_back(_Val);
		return (*this);
		}

	back_insert_iterator<_Container>& operator*()
		{	// pretend to return designated value
		return (*this);
		}

	back_insert_iterator<_Container>& operator++()
		{	// pretend to preincrement
		return (*this);
		}

	back_insert_iterator<_Container> operator++(int)
		{	// pretend to postincrement
		return (*this);
		}

protected:
	_Container *container;	// pointer to container
	};

		// TEMPLATE FUNCTION back_inserter
template<class _Container> inline
	back_insert_iterator<_Container> back_inserter(_Container& _Cont)
	{	// return a back_insert_iterator
	return (std::back_insert_iterator<_Container>(_Cont));
	}

		// TEMPLATE CLASS front_insert_iterator
template<class _Container>
	class front_insert_iterator
		: public _Outit
	{	// wrap pushes to front of container as output iterator
public:
	typedef _Container container_type;
	typedef typename _Container::reference reference;

	explicit front_insert_iterator(_Container& _Cont)
		: container(&_Cont)
		{	// construct with container
		}

	front_insert_iterator<_Container>& operator=(
		typename _Container::const_reference _Val)
		{	// push value into container
		container->push_front(_Val);
		return (*this);
		}

	front_insert_iterator<_Container>& operator*()
		{	// pretend to return designated value
		return (*this);
		}

	front_insert_iterator<_Container>& operator++()
		{	// pretend to preincrement
		return (*this);
		}

	front_insert_iterator<_Container> operator++(int)
		{	// pretend to postincrement
		return (*this);
		}

protected:
	_Container *container;	// pointer to container
	};

		// TEMPLATE FUNCTION front_inserter
template<class _Container> inline
	front_insert_iterator<_Container> front_inserter(_Container& _Cont)
	{	// return front_insert_iterator
	return (std::front_insert_iterator<_Container>(_Cont));
	}

		// TEMPLATE CLASS insert_iterator
template<class _Container>
	class insert_iterator
		: public _Outit
	{	// wrap inserts into container as output iterator
public:
	typedef _Container container_type;
	typedef typename _Container::reference reference;

	insert_iterator(_Container& _Cont, typename _Container::iterator _Where)
		: container(&_Cont), iter(_Where)
		{	// construct with container and iterator
		}

	insert_iterator<_Container>& operator=(
		typename _Container::const_reference _Val)
		{	// insert into container and increment stored iterator
		iter = container->insert(iter, _Val);
		++iter;
		return (*this);
		}

	insert_iterator<_Container>& operator*()
		{	// pretend to return designated value
		return (*this);
		}

	insert_iterator<_Container>& operator++()
		{	// pretend to preincrement
		return (*this);
		}

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

protected:
	_Container *container;	// pointer to container
	typename _Container::iterator iter;	// iterator into container
	};

		// TEMPLATE FUNCTION inserter
template<class _Container,
	class _Iter> inline
	insert_iterator<_Container> inserter(_Container& _Cont, _Iter _Where)
	{	// return insert_iterator
	return (std::insert_iterator<_Container>(_Cont, _Where));
	}

		// TEMPLATE CLASS istream_iterator
template<class _Ty,
	class _Elem = char,
	class _Traits = char_traits<_Elem>,
	class _Diff = ptrdiff_t>
	class istream_iterator
		: public iterator<input_iterator_tag, _Ty, _Diff,
			const _Ty *, const _Ty&>
	{	// wrap _Ty extracts from input stream as input iterator
public:
	typedef istream_iterator<_Ty, _Elem, _Traits, _Diff> _Myt;
	typedef _Elem char_type;
	typedef _Traits traits_type;
	typedef basic_istream<_Elem, _Traits> istream_type;

	istream_iterator()
		: _Myistr(0)
		{	// construct singular iterator
		}

	istream_iterator(istream_type& _Istr)
		: _Myistr(&_Istr)
		{	// construct with input stream
		_Getval();
		}

	const _Ty& operator*() const
		{	// return designated value
		return (_Myval);
		}

	const _Ty *operator->() const
		{	// return pointer to class object
		return (&**this);
		}

	_Myt& operator++()
		{	// preincrement
		_Getval();
		return (*this);
		}

	_Myt operator++(int)
		{	// postincrement
		_Myt _Tmp = *this;
		++*this;
		return (_Tmp);
		}

	bool _Equal(const _Myt& _Right) const
		{	// test for iterator equality
		return (_Myistr == _Right._Myistr);
		}

protected:
	void _Getval()
		{	// get a _Ty value if possible
		if (_Myistr != 0 && !(*_Myistr >> _Myval))
			_Myistr = 0;
		}

	istream_type *_Myistr;	// pointer to input stream
	_Ty _Myval;	// lookahead value (valid if _Myistr is not null)
	};

		// istream_iterator TEMPLATE OPERATORS
template<class _Ty, class _Elem, class _Traits, class _Diff> inline
	bool operator==(
		const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Left,
		const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Right)
	{	// test for istream_iterator equality
	return (_Left._Equal(_Right));
	}

template<class _Ty, class _Elem, class _Traits, class _Diff> inline
	bool operator!=(
		const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Left,
		const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Right)
	{	// test for istream_iterator inequality
	return (!(_Left == _Right));
	}

		// TEMPLATE CLASS ostream_iterator
template<class _Ty, class _Elem = char,
	class _Traits = char_traits<_Elem> >
	class ostream_iterator
		: public _Outit
	{	// wrap _Ty inserts to output stream as output iterator
public:
	typedef _Elem char_type;
	typedef _Traits traits_type;
	typedef basic_ostream<_Elem, _Traits> ostream_type;

	ostream_iterator(ostream_type& _Ostr,
		const _Elem *_Delim = 0)
		: _Myostr(&_Ostr), _Mydelim(_Delim)
		{	// construct from output stream and delimiter
		}

	ostream_iterator<_Ty, _Elem, _Traits>& operator=(const _Ty& _Val)
		{	// insert value into output stream, followed by delimiter
		*_Myostr << _Val;
		if (_Mydelim != 0)
			*_Myostr << _Mydelim;
		return (*this);
		}

	ostream_iterator<_Ty, _Elem, _Traits>& operator*()
		{	// pretend to return designated value
		return (*this);
		}

	ostream_iterator<_Ty, _Elem, _Traits>& operator++()
		{	// pretend to preincrement
		return (*this);
		}

	ostream_iterator<_Ty, _Elem, _Traits> operator++(int)
		{	// pretend to postincrement
		return (*this);
		}

protected:
	const _Elem *_Mydelim;	// pointer to delimiter string (NB: not freed)
	ostream_type *_Myostr;	// pointer to output stream
	};

		// TEMPLATE FUNCTION _Val_type
template<class _Iter> inline
	typename iterator_traits<_Iter>::value_type *_Val_type(_Iter)
	{	// return value type from arbitrary argument
	return (0);
	}


		// TEMPLATE FUNCTION advance
template<class _InIt, class _Diff> inline
	void advance(_InIt& _Where, _Diff _Off)
	{	// increment iterator by offset, arbitrary iterators
	_Advance(_Where, _Off, _Iter_cat(_Where));
	}

template<class _InIt, class _Diff> inline
	void _Advance(_InIt& _Where, _Diff _Off, input_iterator_tag)
	{	// increment iterator by offset, input iterators
	for (; 0 < _Off; --_Off)
		++_Where;
	}

template<class _FI, class _Diff> inline
	void _Advance(_FI& _Where, _Diff _Off, forward_iterator_tag)
	{	// increment iterator by offset, forward iterators
	for (; 0 < _Off; --_Off)
		++_Where;
	}

template<class _BI, class _Diff> inline
	void _Advance(_BI& _Where, _Diff _Off, bidirectional_iterator_tag)
	{	// increment iterator by offset, bidirectional iterators
	for (; 0 < _Off; --_Off)
		++_Where;
	for (; _Off < 0; ++_Off)
		--_Where;
	}

template<class _RI, class _Diff> inline
	void _Advance(_RI& _Where, _Diff _Off, random_access_iterator_tag)
	{	// increment iterator by offset, random-access iterators
	_Where += _Off;
	}

		// TEMPLATE FUNCTION _Dist_type
template<class _Iter> inline
	typename iterator_traits<_Iter>::difference_type
		*_Dist_type(_Iter)
	{	// return distance type from arbitrary argument
	return (0);
	}


_STD_END
#pragma warning(pop)
#pragma pack(pop)

#endif /* _ITERATOR_ */

/*
 * Copyright (c) 1992-2002 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.
 V3.13:0009 */
