Differential D58 Diff 257 EvtGenBase/EvtStreamAdapter.hh

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EvtGenBase/EvtStreamAdapter.hh

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	};			};

	// N points are read from a generated stream.			// N points are read from a generated stream.

	template <class Point, class Generator>			template <class Point, class Generator>
	class EvtGenStreamAdapter : public EvtStreamAdapter<Point> {			class EvtGenStreamAdapter : public EvtStreamAdapter<Point> {
	public:			public:
	EvtGenStreamAdapter( Generator gen, int count ) :			EvtGenStreamAdapter( Generator gen, int count ) :
	_gen( gen ), _count( count )			m_gen( gen ), m_count( count )
	{			{
	}			}

	virtual ~EvtGenStreamAdapter() {}			virtual ~EvtGenStreamAdapter() {}

	EvtStreamAdapter<Point>* clone() const override			EvtStreamAdapter<Point>* clone() const override
	{			{
	return new EvtGenStreamAdapter( *this );			return new EvtGenStreamAdapter( *this );
	}			}
	Point currentValue() override { return _gen(); }			Point currentValue() override { return m_gen(); }
	bool pastEnd() override { return ( _count <= 0 ); }			bool pastEnd() override { return ( m_count <= 0 ); }
	void advance() override { _count--; }			void advance() override { m_count--; }

	private:			private:
	Generator _gen;			Generator m_gen;
	int _count; // also serves as past the end indicator			int m_count; // also serves as past the end indicator
	};			};

	// Only points satisfying a predicate are read from the stream.			// Only points satisfying a predicate are read from the stream.

	template <class Point, class Iterator, class Predicate>			template <class Point, class Iterator, class Predicate>
	class EvtPredStreamAdapter : public EvtStreamAdapter<Point> {			class EvtPredStreamAdapter : public EvtStreamAdapter<Point> {
	public:			public:
	EvtPredStreamAdapter( Predicate pred, Iterator it, Iterator end ) :			EvtPredStreamAdapter( Predicate pred, Iterator it, Iterator end ) :
	_pred( pred ), _it( it ), _end( end )			m_pred( pred ), m_it( it ), m_end( end )
	{			{
	}			}
	virtual ~EvtPredStreamAdapter() {}			virtual ~EvtPredStreamAdapter() {}

	virtual EvtStreamAdapter<Point>* clone() const			virtual EvtStreamAdapter<Point>* clone() const
	{			{
	return new EvtPredStreamAdapter( *this );			return new EvtPredStreamAdapter( *this );
	}			}
	virtual Point currentValue()			virtual Point currentValue()
	{			{
	Point value;			Point value;
	while ( !pastEnd() ) {			while ( !pastEnd() ) {
	value = *_it;			value = *m_it;
	if ( _pred( value ) )			if ( m_pred( value ) )
	break;			break;
	_it++;			m_it++;
	}			}
	return value;			return value;
	}			}

	virtual bool pastEnd() { return _it == _end; }			virtual bool pastEnd() { return m_it == m_end; }
	virtual void advance() { _it++; }			virtual void advance() { m_it++; }

	private:			private:
	Predicate _pred;			Predicate m_pred;
	Iterator _it;			Iterator m_it;
	Iterator _end;			Iterator m_end;
	};			};

	#endif			#endif