From c52c0e591be55cb2c7251689c69c642e3cb3601c Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 11 Apr 2014 20:28:56 +0300
Subject: [PATCH] Add a function to check if a track chain forms a loop

---
 source/libr2c2/trackchain.cpp | 5 +++++
 source/libr2c2/trackchain.h   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/source/libr2c2/trackchain.cpp b/source/libr2c2/trackchain.cpp
index b256b70..0c3282a 100644
--- a/source/libr2c2/trackchain.cpp
+++ b/source/libr2c2/trackchain.cpp
@@ -135,6 +135,11 @@ bool TrackChain::has_track(Track &t) const
 	return tracks.count(&t);
 }
 
+bool TrackChain::is_loop() const
+{
+	return !tracks.empty() && !ends[0] && !ends[1];
+}
+
 void TrackChain::object_removed(Object &obj)
 {
 	if(Track *track = dynamic_cast<Track *>(&obj))
diff --git a/source/libr2c2/trackchain.h b/source/libr2c2/trackchain.h
index e2d6176..7d3c518 100644
--- a/source/libr2c2/trackchain.h
+++ b/source/libr2c2/trackchain.h
@@ -63,6 +63,7 @@ private:
 public:
 	const TrackSet &get_tracks() const { return tracks; }
 	bool has_track(Track &) const;
+	bool is_loop() const;
 
 private:
 	void object_removed(Object &);
-- 
2.45.2