X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibr2c2%2Ftrackchain.h;h=74d194884e48eac531991f3f552bd95302abd612;hb=8c7fc0b79ce88e0295e0e6ea52cb7eb753158d8a;hp=7d3c518a92842aa076350b701182b7fd6054df86;hpb=c52c0e591be55cb2c7251689c69c642e3cb3601c;p=r2c2.git

diff --git a/source/libr2c2/trackchain.h b/source/libr2c2/trackchain.h
index 7d3c518..74d1948 100644
--- a/source/libr2c2/trackchain.h
+++ b/source/libr2c2/trackchain.h
@@ -23,6 +23,13 @@ public:
 class TrackChain: public sigc::trackable
 {
 public:
+	enum Direction
+	{
+		UNSPECIFIED,
+		UP,
+		DOWN
+	};
+
 	typedef std::set<Track *> TrackSet;
 
 protected:
@@ -63,6 +70,9 @@ private:
 public:
 	const TrackSet &get_tracks() const { return tracks; }
 	bool has_track(Track &) const;
+	virtual TrackIter iter_for(Track &, Direction) const;
+	TrackIter get_end(unsigned) const;
+	virtual TrackIter get_end(Direction) const { return get_end(0); }
 	bool is_loop() const;
 
 private:
@@ -72,6 +82,10 @@ public:
 	virtual Msp::DataFile::Statement save_reference() const = 0;
 };
 
+
+void operator<<(Msp::LexicalConverter &, TrackChain::Direction);
+void operator>>(const Msp::LexicalConverter &, TrackChain::Direction &);
+
 } // namespace R2C2
 
 #endif