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#ifndef EXT_STREAM_INCLUDED
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#define EXT_STREAM_INCLUDED
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namespace ext {
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class stream_base
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{
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	public:
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		enum state
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		{
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			goodbit=0,
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			failbit=1,
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			eofbit=2,
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			badbit=4
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		};
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	private:
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		int m_state;
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		int m_flags;
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	public:
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		stream_base() { m_flags=0; clear(goodbit); }
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		virtual ~stream_base() { }
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		void clear(state s) { m_state=s; }
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		int setstate(state s)
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		{
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			int old=m_state;
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			m_state|=s;
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			return old;
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		}
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		int rdstate() const { return m_state; }
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		bool good() const { return rdstate() == goodbit; }
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		bool bad() const { return (rdstate() & badbit) > 0; }
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		bool fail() const { return ((rdstate() & (failbit | badbit))!=0); }
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		bool eof() const { return (rdstate() & eofbit) > 0; }
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		int flags() const	{	return m_flags;	}
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		int flags(int newflags)
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		{
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			int old=m_flags;
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			m_flags = newflags;
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			return old;
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		}
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		int setf(int newflags)
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		{
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			int old=m_flags;
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			m_flags|=newflags;
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			return old;
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		}
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		void unsetf(int mask)	{	m_flags&=~mask;	}
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};
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}
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#endif // !defined(EXT_STREAM_INCLUDED)