deque

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	reference at(size_type _P)
		{if (size() <= _P)
			_Xran();
		return (*(begin() + _P)); }
	const_reference operator[](size_type _P) const
		{return (*(begin() + _P)); }
	reference operator[](size_type _P)
		{return (*(begin() + _P)); }
	reference front()
		{return (*begin()); }
	const_reference front() const
		{return (*begin()); }
	reference back()
		{return (*(end() - 1)); }
	const_reference back() const
		{return (*(end() - 1)); }
	void push_front(const _Ty& _X)
		{if (_Offset % _DEQUESIZ == 0
			&& _Mapsize <= (_Size + _DEQUESIZ) / _DEQUESIZ)
			_Growmap(1);
		size_type _Newoff = _Offset != 0 ? _Offset
			: _Mapsize * _DEQUESIZ;
		size_type _Block = --_Newoff / _DEQUESIZ;
		if (_Map[_Block] == 0)
			_Map[_Block] = _Alval.allocate(_DEQUESIZ, (void *)0);
		_TRY_BEGIN
		_Offset = _Newoff;
		++_Size;
		_Alval.construct(_Map[_Block] + _Newoff % _DEQUESIZ, _X);
		_CATCH_ALL
		pop_front();
		_RERAISE;
		_CATCH_END }
	void pop_front()
		{if (!empty())
			{size_type _Block = _Offset / _DEQUESIZ;
			_Alval.destroy(_Map[_Block] + _Offset % _DEQUESIZ);
			if (_Mapsize * _DEQUESIZ <= ++_Offset)
				_Offset = 0;
			if (--_Size == 0)
				_Offset = 0; }}
	void push_back(const _Ty& _X)
		{if ((_Offset + _Size) % _DEQUESIZ == 0
			&& _Mapsize <= (_Size + _DEQUESIZ) / _DEQUESIZ)
			_Growmap(1);
		size_type _Newoff = _Offset + _Size;
		size_type _Block = _Newoff / _DEQUESIZ;
		if (_Mapsize <= _Block)
			_Block -= _Mapsize;
		if (_Map[_Block] == 0)
			_Map[_Block] = _Alval.allocate(_DEQUESIZ, (void *)0);
		_TRY_BEGIN
		++_Size;
		_Alval.construct(_Map[_Block] + _Newoff % _DEQUESIZ, _X);
		_CATCH_ALL
		pop_back();
		_RERAISE;
		_CATCH_END }
	void pop_back()
		{if (!empty())
			{size_type _Newoff = _Size + _Offset - 1;
			size_type _Block = _Newoff / _DEQUESIZ;
			if (_Mapsize <= _Block)
				_Block -= _Mapsize;
			_Alval.destroy(_Map[_Block] + _Newoff % _DEQUESIZ);
			if (--_Size == 0)
				_Offset = 0; }}
	template<class _It>
		void assign(_It _F, _It _L)
		{_Assign(_F, _L, _Iter_cat(_F)); }
	template<class _It>
		void _Assign(_It _F, _It _L, input_iterator_tag)
		{erase(begin(), end());
		insert(begin(), _F, _L); }
	void assign(size_type _N)
		{_Ty _Tx;
		erase(begin(), end());
		insert(begin(), _N, _Tx); }
	void assign(size_type _N, const _Ty& _X)
		{_Ty _Tx = _X;
		erase(begin(), end());
		insert(begin(), _N, _Tx); }
	iterator insert(iterator _P, const _Ty& _X)
		{if (_P == begin())
			{push_front(_X);
			return (begin()); }
		else if (_P == end())
			{push_back(_X);
			return (end() - 1); }
		else
			{iterator _S;
			size_type _Off = _P - begin();
			_Ty _Tx = _X;
			if (_Off < size() / 2)
				{push_front(front());
				_S = begin() + _Off;
				copy(begin() + 2, _S + 1, begin() + 1); }
			else
				{push_back(back());
				_S = begin() + _Off;
				copy_backward(_S, end() - 2, end() - 1); }
			*_S = _Tx;
			return (_S); }}
	void insert(iterator _P, size_type _M, const _Ty& _X)
		{iterator _S;
		size_type _I;
		size_type _Off = _P - begin();
		size_type _Rem = _Size - _Off;
		if (_Off < _Rem)
			if (_Off < _M)
				{for (_I = _M - _Off; 0 < _I; --_I)
					push_front(_X);
				for (_I = _Off; 0 < _I; --_I)
					push_front(begin()[_M - 1]);
				_S = begin() + _M;
				fill(_S, _S + _Off, _X); }
			else
				{for (_I = _M; 0 < _I; --_I)
					push_front(begin()[_M - 1]);
				_S = begin() + _M;
				_Ty _Tx = _X;
				copy(_S + _M, _S + _Off, _S);
				fill(begin() + _Off, _S + _Off, _Tx); }
		else
			if (_Rem < _M)
				{for (_I = _M - _Rem; 0 < _I; --_I)
					push_back(_X);
				for (_I = 0; _I < _Rem; ++_I)
					push_back(begin()[_Off + _I]);
				_S = begin() + _Off;
				fill(_S, _S + _Rem, _X); }
			else
				{for (_I = 0; _I < _M; ++_I)
					push_back(begin()[_Off + _Rem - _M + _I]);
				_S = begin() + _Off;
				_Ty _Tx = _X;
				copy_backward(_S, _S + _Rem - _M, _S + _Rem);
				fill(_S, _S + _M, _Tx); }}
	template<class _It>
		void insert(iterator _P, _It _F, _It _L)
		{_Insert(_P, _F, _L, _Iter_cat(_F)); }
	template<class _It>
		void _Insert(iterator _P, _It _F, _It _L,
			input_iterator_tag)
		{size_type _Off = _P - begin();
		for (; _F != _L; ++_F, ++_Off)
			insert(begin() + _Off, *_F); }
	template<class _It>
		void _Insert(iterator _P, _It _F, _It _L,
			bidirectional_iterator_tag)
		{size_type _M = 0;
		_Distance(_F, _L, _M);
		size_type _I;
		size_type _Off = _P - begin();
		size_type _Rem = _Size - _Off;
		if (_Off < _Rem)
			if (_Off < _M)
				{_It _Qx = _F;
				advance(_Qx, _M - _Off);
				for (_It _Q = _Qx; _F != _Q; )
					push_front(*--_Q);
				for (_I = _Off; 0 < _I; --_I)
					push_front(begin()[_M - 1]);
				copy(_Qx, _L, begin() + _M); }
			else
				{for (_I = _M; 0 < _I; --_I)
					push_front(begin()[_M - 1]);
				iterator _S = begin() + _M;
				copy(_S + _M, _S + _Off, _S);
				copy(_F, _L, begin() + _Off); }
		else
			if (_Rem < _M)
				{_It _Qx = _F;
				advance(_Qx, _Rem);
				for (_It _Q = _Qx; _Q != _L; ++_Q)
					push_back(*_Q);
				for (_I = 0; _I < _Rem; ++_I)
					push_back(begin()[_Off + _I]);
				copy(_F, _Qx, begin() + _Off); }
			else
				{for (_I = 0; _I < _M; ++_I)
					push_back(begin()[_Off + _Rem - _M + _I]);
				iterator _S = begin() + _Off;
				copy_backward(_S, _S + _Rem - _M, _S + _Rem);
				copy(_F, _L, _S); }}
	iterator erase(iterator _P)
		{return (erase(_P, _P + 1)); }
	iterator erase(iterator _F, iterator _L)
		{size_type _N = _L - _F;
		size_type _M = _F - begin();
		if (_M < (size_type)(end() - _L))
			{copy_backward(begin(), _F, _L);
			for (; 0 < _N; --_N)
				pop_front(); }
		else
			{copy(_L, end(), _F);
			for (; 0 < _N; --_N)
				pop_back(); }
		return (_M == 0 ? begin() : begin() + _M); }
	void clear()
		{while (!empty())
			pop_back();
		_Freemap(); }
	void swap(_Myt& _X)
		{if (_Alval == _X._Alval)
			{std::swap(_Map, _X._Map);
			std::swap(_Mapsize, _X._Mapsize);
			std::swap(_Offset, _X._Offset);
			std::swap(_Size, _X._Size); }
		else
			{_Myt _Ts = *this; *this = _X, _X = _Ts; }}
	friend void swap(_Myt& _X, _Myt& _Y)
		{_X.swap(_Y); }

protected:
	void _Xlen() const
		{_THROW(length_error, "deque<T> too long"); }
	void _Xran() const
		{_THROW(out_of_range, "invalid deque<T> subscript"); }

	void _Freemap()
		{for (size_type _M = _Mapsize; 0 < _M; )
			_Alval.deallocate(*(_Map + --_M), _DEQUESIZ);
		_Alval.deallocate(_Map, _Mapsize);
		_Mapsize = 0;
		_Map = 0; }
	void _Growmap(size_type _N)
		{if (max_size() / _DEQUESIZ - _Mapsize < _N)
			_Xlen();
		size_type _I = _Mapsize / 2;	// try to grow by 50%
		if (_I < _DEQUEMAPSIZ)
			_I = _DEQUEMAPSIZ;
		if (_N < _I && _Mapsize <= max_size() / _DEQUESIZ - _I)
			_N = _I;
		size_type _Ib = _Offset / _DEQUESIZ;
		_Mapptr _M = (_Mapptr)_Alval._Charalloc(
			(_Mapsize + _N) * sizeof (_Tptr));
		_Mapptr _Mn = copy(_Map + _Ib, _Map + _Mapsize,
			_M + _Ib);
		if (_Ib <= _N)
			{_Mn = copy(_Map, _Map + _Ib, _Mn);
			fill_n(_Mn, _N - _Ib, (_Tptr)0);
			fill_n(_M, _Ib, (_Tptr)0); }
		else
			{copy(_Map, _Map + _N, _Mn);
			_Mn = copy(_Map + _N, _Map + _Ib, _M);
			fill_n(_Mn, _N, (_Tptr)0); }
		_Alval.deallocate(_Map, _Mapsize);	// free storage for old
		_Map = _M;
		_Mapsize += _N; }

	_Mapptr _Map;
	size_type _Mapsize, _Offset, _Size;
	};
	
	// deque TEMPLATE OPERATORS
template<class _Ty, class _A> inline
	bool operator==(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (_X.size() == _Y.size()
		&& equal(_X.begin(), _X.end(), _Y.begin())); }
template<class _Ty, class _A> inline
	bool operator!=(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (!(_X == _Y)); }
template<class _Ty, class _A> inline
	bool operator<(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (lexicographical_compare(_X.begin(), _X.end(),
		_Y.begin(), _Y.end())); }
template<class _Ty, class _A> inline
	bool operator<=(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (!(_Y < _X)); }
template<class _Ty, class _A> inline
	bool operator>(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (_Y < _X); }
template<class _Ty, class _A> inline
	bool operator>=(const deque<_Ty, _A>& _X,
		const deque<_Ty, _A>& _Y)
	{return (!(_X < _Y)); }
_STD_END
 #if 1200 <= _MSC_VER
 #pragma warning(default:4284)
 #endif
#if 1200 <= _MSC_VER
#pragma warning(pop)
#endif
#ifdef  _MSC_VER
#pragma pack(pop)
#endif  /* _MSC_VER */

#endif /* _DEQUE_ */

/*
 * Copyright (c) 1995-1999 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.
 V2.33:0009 */