fstream

C语言库函数的原型,有用的拿去

						}
					else
						_Str.erase((size_t)0,	// partial, discard used input
							(size_t)(_Src - &*_Str.begin()));
					break;

				case codecvt_base::noconv:
					if (_Str.size() < sizeof (_Elem))
						break;	// no conversion, but need more chars

					_CRT_SECURE_MEMCPY(&_Ch, sizeof (_Elem), &*_Str.begin(),
						sizeof (_Elem));	// copy raw bytes to element

					return (_Traits::to_int_type(_Ch));	// return result

				default:
					return (_Traits::eof());	// conversion failed
					}
				}
			}
		}

	virtual pos_type __CLR_OR_THIS_CALL seekoff(off_type _Off,
		ios_base::seekdir _Way,
		ios_base::openmode =
			(ios_base::openmode)(ios_base::in | ios_base::out))
		{	// change position by _Off
		fpos_t _Fileposition;

		if (_Mysb::gptr() == &_Mychar	// something putback
			&& _Way == ios_base::cur	// a relative seek
			&& _Pcvt == 0)	// not converting
			_Off -= (off_type)sizeof (_Elem);	// back up over _Elem bytes

		if (_Myfile == 0 || !_Endwrite()
			|| (_Off != 0 || _Way != ios_base::cur)
				&& _FSEEK_OFF(_Myfile, _Off, _Way) != 0
			|| fgetpos(_Myfile, &_Fileposition) != 0)
			return (pos_type(_BADOFF));	// report failure

		_Reset_back();	// revert from _Mychar buffer, discarding any putback
		return (_POS_TYPE_FROM_STATE(pos_type, _State,
			_Fileposition));	// return new position
		}

	virtual pos_type __CLR_OR_THIS_CALL seekpos(pos_type _Pos,
		ios_base::openmode =
			(ios_base::openmode)(ios_base::in | ios_base::out))
		{	// change position to _Pos
		fpos_t _Fileposition = _POS_TYPE_TO_FPOS_T(_Pos);
		off_type _Off = (off_type)_Pos - (off_type)_FPOSOFF(_Fileposition);

		if (_Myfile == 0 || !_Endwrite()
			|| fsetpos(_Myfile, &_Fileposition) != 0
			|| _Off != 0 && _FSEEK_OFF(_Myfile, _Off, SEEK_CUR) != 0
			|| fgetpos(_Myfile, &_Fileposition) != 0)
			return (pos_type(_BADOFF));	// report failure

		_State = _POS_TYPE_TO_STATE(_Pos);

		_Reset_back();	// revert from _Mychar buffer, discarding any putback
		return (_POS_TYPE_FROM_STATE(pos_type, _State,
			_Fileposition));	// return new position
		}

	virtual _Mysb *__CLR_OR_THIS_CALL setbuf(_Elem *_Buffer, streamsize _Count)
		{	// offer _Buffer to C stream
		if (_Myfile == 0 || setvbuf(_Myfile, (char *)_Buffer,
			_Buffer == 0 && _Count == 0 ? _IONBF : _IOFBF,
			(size_t)_Count * sizeof (_Elem)) != 0)
			return (0);	// failed
		else
			{	// new buffer, reinitialize pointers
			_Init(_Myfile, _Openfl);
			return (this);
			}
		}

	virtual int __CLR_OR_THIS_CALL sync()
		{	// synchronize C stream with external file
		return (_Myfile == 0
			|| _Traits::eq_int_type(_Traits::eof(), overflow())
			|| 0 <= fflush(_Myfile) ? 0 : -1);
		}

	virtual void __CLR_OR_THIS_CALL imbue(const locale& _Loc)
		{	// set locale to argument (capture nontrivial codecvt facet)
		_Initcvt(&_USE(_Loc, _Cvt));
		}

	void _Init(_Filet *_File, _Initfl _Which)
		{	// initialize to C stream _File after {new, open, close}
		__PURE_APPDOMAIN_GLOBAL static _Myst _Stinit;	// initial state

		_Closef = _Which == _Openfl;
		_Wrotesome = false;

		_Mysb::_Init();	// initialize stream buffer base object

 #ifndef _IORCNT
  #define _IORCNT	_IOCNT	/* read and write counts are the same */
  #define _IOWCNT _IOCNT
 #endif /* _IORCNT */

  #pragma warning(push)
  #pragma warning(disable: 6240)	/* prefast noise VSW 489858 */
		if (_File != 0 && sizeof (_Elem) == 1)
  #pragma warning(pop)

			{	// point inside C stream with [first, first + count) buffer
			_Elem **_Pb = (_Elem **)&_File->_IOBASE;
			_Elem **_Pn = (_Elem **)&_File->_IOPTR;
			int *_Nr = (int *)&_File->_IORCNT;
			int *_Nw = (int *)&_File->_IOWCNT;
			_Mysb::_Init(_Pb, _Pn, _Nr, _Pb, _Pn, _Nw);
			}

		_Myfile = _File;
		_State = _Stinit;
		_Pcvt = 0;	// pointer to codecvt facet
		}

	bool _Endwrite()
		{	// put shift to initial conversion state, as needed
		if (_Pcvt == 0 || !_Wrotesome)
			return (true);
		else
			{	// may have to put
			const int _STRING_INC = 8;
			char *_Dest;
			if (_Traits::eq_int_type(_Traits::eof(), overflow()))
				return (false);

			string _Str(_STRING_INC, '\0');
			for (; ; )
				switch (_Pcvt->unshift(_State,
					&*_Str.begin(), &*_Str.begin() + _Str.size(), _Dest))
				{	// test result of homing conversion
				case codecvt_base::ok:
					_Wrotesome = false;	// homed successfully

				case codecvt_base::partial:	// fall through
					{	// put any generated bytes
					size_t _Count = _Dest - &*_Str.begin();
					if (0 < _Count && _Count !=
						fwrite(&*_Str.begin(), 1, _Count, _Myfile))
						return (false);	// write failed
					if (!_Wrotesome)
						return (true);
					if (_Count == 0)
						_Str.append(_STRING_INC, '\0');	// try with more space
					break;
					}

				case codecvt_base::noconv:
					return (true);	// nothing to do

				default:
					return (false);	// conversion failed
				}
			}
		}

	void _Initcvt(const _Cvt *_Newpcvt)
		{	// initialize codecvt pointer
		if (_Newpcvt->always_noconv())
			_Pcvt = 0;	// nothing to do
		else
			{	// set up for nontrivial codecvt facet
			_Pcvt = _Newpcvt;
			_Mysb::_Init();	// reset any buffering
			}
		}

private:
	void _Reset_back()
		{	// restore buffer after putback
		if (_Mysb::eback() == &_Mychar)
			_Mysb::setg(_Set_eback, _Set_egptr, _Set_egptr);
		}

	void _Set_back()
		{	// set up putback area
		if (_Mysb::eback() != &_Mychar)
			{	// save current get buffer
			_Set_eback = _Mysb::eback();
			_Set_egptr = _Mysb::egptr();
			}
		_Mysb::setg(&_Mychar, &_Mychar, &_Mychar + 1);
		}

	_Elem *_Set_eback;	// saves eback() during one-element putback
	_Elem *_Set_egptr;	// saves egptr()

	const _Cvt *_Pcvt;	// pointer to codecvt facet (may be null)
	_Elem _Mychar;	// putback character, when _Ungetc fails
	bool _Wrotesome;	// true if homing sequence may be needed
	typename _Traits::state_type _State;	// current conversion state
	bool _Closef;	// true if C stream must be closed
	_Filet *_Myfile;	// pointer to C stream
	};

	// basic_filebuf TEMPLATE OPERATORS
template<class _Elem,
	class _Traits> inline
	void swap(basic_filebuf<_Elem, _Traits>& _Left,
		basic_filebuf<_Elem, _Traits>& _Right)
	{	// swap _Left and _Right basic_filebufs
	_Left.swap(_Right);
	}

template<class _Elem,
	class _Traits> inline
	void swap(basic_filebuf<_Elem, _Traits>& _Left,
		basic_filebuf<_Elem, _Traits>&& _Right)
	{	// swap _Left and _Right basic_filebufs
	typedef basic_filebuf<_Elem, _Traits> _Myt;
	_Left.swap(_STD forward<_Myt>(_Right));
	}

template<class _Elem,
	class _Traits> inline
	void swap(basic_filebuf<_Elem, _Traits>&& _Left,
		basic_filebuf<_Elem, _Traits>& _Right)
	{	// swap _Left and _Right basic_filebuf
	typedef basic_filebuf<_Elem, _Traits> _Myt;
	_Right.swap(_STD forward<_Myt>(_Left));
	}

		// TEMPLATE CLASS basic_ifstream
template<class _Elem,
	class _Traits>
	class basic_ifstream
		: public basic_istream<_Elem, _Traits>
	{	// input stream associated with a C stream
public:
	typedef basic_ifstream<_Elem, _Traits> _Myt;
	typedef basic_istream<_Elem, _Traits> _Mybase;
	typedef basic_filebuf<_Elem, _Traits> _Myfb;
	typedef basic_ios<_Elem, _Traits> _Myios;

	basic_ifstream()
		: _Mybase(&_Filebuffer)
		{	// construct unopened
		}

	explicit basic_ifstream(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		: _Mybase(&_Filebuffer)
		{	// construct with named file and specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		}

 #if _HAS_CPP0X
	explicit basic_ifstream(const string& _Str,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		: _Mybase(&_Filebuffer)
		{	// construct with named file and specified mode
		if (_Filebuffer.open(_Str.c_str(), _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		}
 #endif /* _HAS_CPP0X */

	explicit basic_ifstream(const wchar_t *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		: _Mybase(&_Filebuffer)
		{	// construct with wide-named file -- EXTENSION
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		}

 #if _HAS_CPP0X
	explicit basic_ifstream(const wstring& _Str,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		: _Mybase(&_Filebuffer)
		{	// construct with wide-named file -- EXTENSION
		if (_Filebuffer.open(_Str.c_str(), _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		}
 #endif /* _HAS_CPP0X */

 #ifdef _NATIVE_WCHAR_T_DEFINED
	explicit basic_ifstream(const unsigned short *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		: _Mybase(&_Filebuffer)
		{	// construct with wide-named file -- EXTENSION
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		}
 #endif /* _NATIVE_WCHAR_T_DEFINED */

	explicit basic_ifstream(_Filet *_File)
		: _Mybase(&_Filebuffer),
			_Filebuffer(_File)
		{	// construct with specified C stream
		}

	basic_ifstream(_Myt&& _Right)
		: _Mybase(&_Filebuffer)
		{	// construct by moving _Right
		_Assign_rv(_STD forward<_Myt>(_Right));
		}

	_Myt& operator=(_Myt&& _Right)
		{	// move from _Right
		_Assign_rv(_STD forward<_Myt>(_Right));
		return (*this);
		}

	void _Assign_rv(_Myt&& _Right)
		{	// assign by moving _Right
		if (this != &_Right)
			{	// different, worth moving
			_Filebuffer.close();
			this->swap(_Right);
			}
		}

	void swap(_Myt& _Right)
		{	// swap with _Right
		if (this != &_Right)
			{	// different, swap base and buffer
			_Mybase::swap(_Right);
			_Filebuffer.swap(_Right._Filebuffer);
			}
		}

	void swap(_Myt&& _Right)
		{	// swap with _Right
		_Assign_rv(_STD forward<_Myt>(_Right));
		}

	void open(const wchar_t *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		{	// open a wide-named C stream -- EXTENSION
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		else
			_Myios::clear();	// added with C++0X
		}

 #if _HAS_CPP0X
	void open(const wstring& _Str,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		{	// open a wide-named C stream -- EXTENSION
		open(_Str.c_str(), _Mode, _Prot);
		}
 #endif /* _HAS_CPP0X */

	void open(const wchar_t *_Filename, ios_base::open_mode _Mode)
		{	// open wide-named file (old style) -- EXTENSION
		open(_Filename, (ios_base::openmode)_Mode);
		}

 #ifdef _NATIVE_WCHAR_T_DEFINED
	void open(const unsigned short *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		{	// open a wide-named C stream -- EXTENSION
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		else
			_Myios::clear();	// added with C++0X
		}

	void open(const unsigned short *_Filename,
		ios_base::open_mode _Mode)
		{	// open wide-named file (old style) -- EXTENSION
		open(_Filename, (ios_base::openmode)_Mode);
		}
 #endif /* _NATIVE_WCHAR_T_DEFINED */

	virtual __CLR_OR_THIS_CALL ~basic_ifstream()
		{	// destroy the object
		}

	_Myfb *rdbuf() const
		{	// return pointer to file buffer
		return ((_Myfb *)&_Filebuffer);
		}

	bool is_open() const
		{	// test if C stream has been opened
		return (_Filebuffer.is_open());
		}

	void open(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		{	// open a C stream with specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in, _Prot) == 0)
			_Myios::setstate(ios_base::failbit);
		else
			_Myios::clear();	// added with C++0X
		}

 #if _HAS_CPP0X
	void open(const string& _Str,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot)
		{	// open a C stream with specified mode
		open(_Str.c_str(), _Mode, _Prot);
		}
 #endif /* _HAS_CPP0X */

	void open(const char *_Filename, ios_base::open_mode _Mode)
		{	// open named file with specified mode (old style)
		open(_Filename, (ios_base::openmode)_Mode);
		}

	void close()
		{	// close the C stream
		if (_Filebuffer.close() == 0)
			_Myios::setstate(ios_base::failbit);
		}

private:
	_Myfb _Filebuffer;	// the file buffer
	};

	// basic_ifstream TEMPLATE OPERATORS
template<class _Elem,
	class _Traits> inline
	void swap(basic_ifstream<_Elem, _Traits>& _Left,
		basic_ifstream<_Elem, _Traits>& _Right)
	{	// swap _Left and _Right basic_ifstreams
	_Left.swap(_Right);
	}

template<class _Elem,
	class _Traits> inline
	void swap(basic_ifstream<_Elem, _Traits>& _Left,
		basic_ifstream<_Elem, _Traits>&& _Right)
	{	// swap _Left and _Right basic_ifstreams
	typedef basic_ifstream<_Elem, _Traits> _Myt;
	_Left.swap(_STD forward<_Myt>(_Right));
	}

template<class _Elem,
	class _Traits> inline
	void swap(basic_ifstream<_Elem, _Traits>&& _Left,
		basic_ifstream<_Elem, _Traits>& _Right)
	{	// swap _Left and _Right basic_ifstreams
	typedef basic_ifstream<_Elem, _Traits> _Myt;
	_Right.swap(_STD forward<_Myt>(_Left));
	}

		// TEMPLATE CLASS basic_ofstream
template<class _Elem,
	class _Traits>
	class basic_ofstream
		: public basic_ostream<_Elem, _Traits>
	{	// output stream associated with a C stream
public:
	typedef basic_ofstream<_Elem, _Traits> _Myt;