//  nullcodecvt.h : header file for output file stream to support unicode filenames


typedef codecvt < wchar_t, char, mbstate_t > NullCodecvtBase;

class NullCodecvt : public NullCodecvtBase
{

public:
	explicit NullCodecvt( size_t _R=0 ) : NullCodecvtBase(_R) { }

protected:
	virtual result do_in( mbstate_t& _State,
						  const char* _F1,
						  const char* _L1 ,
						  const char*& _Mid1,
						  wchar_t* F2,
						  wchar_t* _L2,
						  wchar_t*& _Mid2 ) const
	{
		return noconv ;
	}

	virtual result do_out( mbstate_t& _State,
						   const char* _F1,
						   const char* _L1,
						   const char*& _Mid1,
						   char* F2,
						   wchar_t* _L2,
						   char*& _Mid2 ) const
	{
		return noconv ;
	}

	virtual result do_unshift( mbstate_t& _State,
							   char* _F2,
							   char* _L2,
							   char*& _Mid2 ) const
	{
		return noconv ;
	}

	virtual int do_length( mbstate_t& _State,
						   const char* _F1,
						   const char* _L1,
						   size_t _N2 ) const throw()
	{
		return (_N2 < (size_t)(_L1 - _F1)) ? _N2 : _L1 - _F1;
	}
	virtual bool do_always_noconv() const throw()
	{
		return true;
	}

	virtual int do_max_length() const throw()
	{
		return 2;
	}

	virtual int do_encoding() const throw()
	{
		return 2;
	}
};