// xstring internal header (from <string>)

#if     _MSC_VER > 1000 /*IFSTRIP=IGN*/
#pragma once
#endif

#ifndef _XSTRING_
#define _XSTRING_
#include <xmemory>

#ifdef  _MSC_VER
#pragma pack(push,8)
#endif  /* _MSC_VER */
 #include <xutility>
_STD_BEGIN
_CRTIMP2 void __cdecl _Xlen();
_CRTIMP2 void __cdecl _Xran();
		// TEMPLATE CLASS basic_string
template<class _E,
	class _Tr = char_traits<_E>,
	class _A = allocator<_E> >
	class basic_string {
public:
	typedef basic_string<_E, _Tr, _A> _Myt;
	typedef _A::size_type size_type;
	typedef _A::difference_type difference_type;
	typedef _A::pointer pointer;
	typedef _A::const_pointer const_pointer;
	typedef _A::reference reference;
	typedef _A::const_reference const_reference;
	typedef _A::value_type value_type;
	typedef _A::pointer iterator;
	typedef _A::const_pointer const_iterator;
	typedef reverse_iterator<const_iterator, value_type,
		const_reference, const_pointer, difference_type>
			const_reverse_iterator;
	typedef reverse_iterator<iterator, value_type,
		reference, pointer, difference_type>
			reverse_iterator;
	explicit basic_string(const _A& _Al = _A())
		: allocator(_Al) {_Tidy(); }
	basic_string(const _Myt& _X)
		: allocator(_X.allocator)
		{_Tidy(), assign(_X, 0, npos); }
	basic_string(const _Myt& _X, size_type _P, size_type _M,
		const _A& _Al = _A())
		: allocator(_Al) {_Tidy(), assign(_X, _P, _M); }
	basic_string(const _E *_S, size_type _N,
		const _A& _Al = _A())
		: allocator(_Al) {_Tidy(), assign(_S, _N); }
	basic_string(const _E *_S, const _A& _Al = _A())
		: allocator(_Al) {_Tidy(), assign(_S); }
	basic_string(size_type _N, _E _C, const _A& _Al = _A())
		: allocator(_Al) {_Tidy(), assign(_N, _C); }
	typedef const_iterator _It;
	basic_string(_It _F, _It _L, const _A& _Al = _A())
		: allocator(_Al) {_Tidy(); assign(_F, _L); }
	~basic_string()
		{_Tidy(true); }
	typedef _Tr traits_type;
	typedef _A allocator_type;
	enum _Mref {_FROZEN = 255};
	static const size_type npos;
	_Myt& operator=(const _Myt& _X)
		{return (assign(_X)); }
	_Myt& operator=(const _E *_S)
		{return (assign(_S)); }
	_Myt& operator=(_E _C)
		{return (assign(1, _C)); }
	_Myt& operator+=(const _Myt& _X)
		{return (append(_X)); }
	_Myt& operator+=(const _E *_S)
		{return (append(_S)); }
	_Myt& operator+=(_E _C)
		{return (append(1, _C)); }
	_Myt& append(const _Myt& _X)
		{return (append(_X, 0, npos)); }
	_Myt& append(const _Myt& _X, size_type _P, size_type _M)
		{if (_X.size() < _P)
			_Xran();
		size_type _N = _X.size() - _P;
		if (_N < _M)
			_M = _N;
		if (npos - _Len <= _M)
			_Xlen();
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::copy(_Ptr + _Len, &_X.c_str()[_P], _M);
			_Eos(_N); }
		return (*this); }
	_Myt& append(const _E *_S, size_type _M)
		{if (npos - _Len <= _M)
			_Xlen();
		size_type _N;
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::copy(_Ptr + _Len, _S, _M);
			_Eos(_N); }
		return (*this); }
	_Myt& append(const _E *_S)
		{return (append(_S, _Tr::length(_S))); }
	_Myt& append(size_type _M, _E _C)
		{if (npos - _Len <= _M)
			_Xlen();
		size_type _N;
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::assign(_Ptr + _Len, _M, _C);
			_Eos(_N); }
		return (*this); }
	_Myt& append(_It _F, _It _L)
		{return (replace(end(), end(), _F, _L)); }
	_Myt& assign(const _Myt& _X)
		{return (assign(_X, 0, npos)); }
	_Myt& assign(const _Myt& _X, size_type _P, size_type _M)
		{if (_X.size() < _P)
			_Xran();
		size_type _N = _X.size() - _P;
		if (_M < _N)
			_N = _M;
		if (this == &_X)
			erase((size_type)(_P + _N)), erase(0, _P);
		else if (0 < _N && _N == _X.size()
			&& _Refcnt(_X.c_str()) < _FROZEN - 1
			&& allocator == _X.allocator)
			{_Tidy(true);
			_Ptr = (_E *)_X.c_str();
			_Len = _X.size();
			_Res = _X.capacity();
			++_Refcnt(_Ptr); }
		else if (_Grow(_N, true))
			{_Tr::copy(_Ptr, &_X.c_str()[_P], _N);
			_Eos(_N); }
		return (*this); }
	_Myt& assign(const _E *_S, size_type _N)
		{if (_Grow(_N, true))
			{_Tr::copy(_Ptr, _S, _N);
			_Eos(_N); }
		return (*this); }
	_Myt& assign(const _E *_S)
		{return (assign(_S, _Tr::length(_S))); }
	_Myt& assign(size_type _N, _E _C)
		{if (_N == npos)
			_Xlen();
		if (_Grow(_N, true))
			{_Tr::assign(_Ptr, _N, _C);
			_Eos(_N); }
		return (*this); }
	_Myt& assign(_It _F, _It _L)
		{return (replace(begin(), end(), _F, _L)); }
	_Myt& insert(size_type _P0, const _Myt& _X)
		{return (insert(_P0, _X, 0, npos)); }
	_Myt& insert(size_type _P0, const _Myt& _X, size_type _P,
		size_type _M)
		{if (_Len < _P0 || _X.size() < _P)
			_Xran();
		size_type _N = _X.size() - _P;
		if (_N < _M)
			_M = _N;
		if (npos - _Len <= _M)
			_Xlen();
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0, _Len - _P0);
			_Tr::copy(_Ptr + _P0, &_X.c_str()[_P], _M);
			_Eos(_N); }
		return (*this); }
	_Myt& insert(size_type _P0, const _E *_S, size_type _M)
		{if (_Len < _P0)
			_Xran();
		if (npos - _Len <= _M)
			_Xlen();
		size_type _N;
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0, _Len - _P0);
			_Tr::copy(_Ptr + _P0, _S, _M);
			_Eos(_N); }
		return (*this); }
	_Myt& insert(size_type _P0, const _E *_S)
		{return (insert(_P0, _S, _Tr::length(_S))); }
	_Myt& insert(size_type _P0, size_type _M, _E _C)
		{if (_Len < _P0)
			_Xran();
		if (npos - _Len <= _M)
			_Xlen();
		size_type _N;
		if (0 < _M && _Grow(_N = _Len + _M))
			{_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0, _Len - _P0);
			_Tr::assign(_Ptr + _P0, _M, _C);
			_Eos(_N); }
		return (*this); }
	iterator insert(iterator _P, _E _C)
		{size_type _P0 = _Pdif(_P, begin());
		insert(_P0, 1, _C);
		return (begin() + _P0); }
	void insert(iterator _P, size_type _M, _E _C)
		{size_type _P0 = _Pdif(_P, begin());
		insert(_P0, _M, _C); }
	void insert(iterator _P, _It _F, _It _L)
		{replace(_P, _P, _F, _L); }
	_Myt& erase(size_type _P0 = 0, size_type _M = npos)
		{if (_Len < _P0)
			_Xran();
		_Split();
		if (_Len - _P0 < _M)
			_M = _Len - _P0;
		if (0 < _M)
			{_Tr::move(_Ptr + _P0, _Ptr + _P0 + _M,
				_Len - _P0 - _M);
			size_type _N = _Len - _M;
			if (_Grow(_N))
				_Eos(_N); }
		return (*this); }
	iterator erase(iterator _P)
		{size_t _M = _Pdif(_P, begin());
		erase(_M, 1);
		return (_Psum(_Ptr, _M)); }
	iterator erase(iterator _F, iterator _L)
		{size_t _M = _Pdif(_F, begin());
		erase(_M, _Pdif(_L, _F));
		return (_Psum(_Ptr, _M)); }
	_Myt& replace(size_type _P0, size_type _N0, const _Myt& _X)
		{return (replace(_P0, _N0, _X, 0, npos)); }
	_Myt& replace(size_type _P0, size_type _N0, const _Myt& _X,
		size_type _P, size_type _M)
		{if (_Len < _P0 || _X.size() < _P)
			_Xran();
		if (_Len - _P0 < _N0)
			_N0 = _Len - _P0;
		size_type _N = _X.size() - _P;
		if (_N < _M)
			_M = _N;
		if (npos - _M <= _Len - _N0)
			_Xlen();
		_Split();
		size_type _Nm = _Len - _N0 - _P0;
		if (_M < _N0)
			_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0, _Nm);
		if ((0 < _M || 0 < _N0) && _Grow(_N = _Len + _M - _N0))
			{if (_N0 < _M)
				_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0, _Nm);
			_Tr::copy(_Ptr + _P0, &_X.c_str()[_P], _M);
			_Eos(_N); }
		return (*this); }
	_Myt& replace(size_type _P0, size_type _N0, const _E *_S,
		size_type _M)
		{if (_Len < _P0)
			_Xran();
		if (_Len - _P0 < _N0)
			_N0 = _Len - _P0;
		if (npos - _M <= _Len - _N0)
			_Xlen();
		_Split();
		size_type _Nm = _Len - _N0 - _P0;
		if (_M < _N0)
			_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0, _Nm);
		size_type _N;
		if ((0 < _M || 0 < _N0) && _Grow(_N = _Len + _M - _N0))
			{if (_N0 < _M)
				_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0, _Nm);
			_Tr::copy(_Ptr + _P0, _S, _M);
			_Eos(_N); }
		return (*this); }
	_Myt& replace(size_type _P0, size_type _N0, const _E *_S)
		{return (replace(_P0, _N0, _S, _Tr::length(_S))); }
	_Myt& replace(size_type _P0, size_type _N0,
		size_type _M, _E _C)
		{if (_Len < _P0)
			_Xran();
		if (_Len - _P0 < _N0)
			_N0 = _Len - _P0;
		if (npos - _M <= _Len - _N0)
			_Xlen();
		_Split();
		size_type _Nm = _Len - _N0 - _P0;
		if (_M < _N0)
			_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0, _Nm);
		size_type _N;
		if ((0 < _M || 0 < _N0) && _Grow(_N = _Len + _M - _N0))
			{if (_N0 < _M)
				_Tr::move(_Ptr + _P0 + _M, _Ptr + _P0 + _N0,
					_Nm);
			_Tr::assign(_Ptr + _P0, _M, _C);
			_Eos(_N); }
		return (*this); }
	_Myt& replace(iterator _F, iterator _L, const _Myt& _X)
		{return (replace(
			_Pdif(_F, begin()), _Pdif(_L, _F), _X)); }
	_Myt& replace(iterator _F, iterator _L, const _E *_S,
		size_type _M)
		{return (replace(
			_Pdif(_F, begin()), _Pdif(_L, _F), _S, _M)); }
	_Myt& replace(iterator _F, iterator _L, const _E *_S)
		{return (replace(
			_Pdif(_F, begin()), _Pdif(_L, _F), _S)); }
	_Myt& replace(iterator _F, iterator _L,	size_type _M, _E _C)
		{return (replace(
			_Pdif(_F, begin()), _Pdif(_L, _F), _M, _C)); }
	_Myt& replace(iterator _F1, iterator _L1,
		_It _F2, _It _L2)
		{size_type _P0 = _Pdif(_F1, begin());
		size_type _M = 0;
		_Distance(_F2, _L2, _M);
		replace(_P0, _Pdif(_L1, _F1), _M, _E(0));
		for (_F1 = begin() + _P0; 0 < _M; ++_F1, ++_F2, --_M)
			*_F1 = *_F2;
		return (*this); }
	iterator begin()
		{_Freeze();
		return (_Ptr); }
	const_iterator begin() const
		{return (_Ptr); }
	iterator end()
		{_Freeze();
		return ((iterator)_Psum(_Ptr, _Len)); }
	const_iterator end() const
		{return ((const_iterator)_Psum(_Ptr, _Len)); }
	reverse_iterator rbegin()
		{return (reverse_iterator(end())); }
	const_reverse_iterator rbegin() const
		{return (const_reverse_iterator(end())); }