1 files changed, 36 insertions, 0 deletions
diff --git a/src/subtitle.cc b/src/subtitle.cc
new file mode 100644
index 0000000..d637ed9
--- /dev/null
+++ b/src/subtitle.cc
@@ -0,0 +1,36 @@
+/*
+    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "subtitle.h"
+
+using namespace sub;
+
+bool
+sub::operator< (Subtitle const & a, Subtitle const & b)
+{
+	if (a.from.frame && b.from.frame) {
+		return a.from.frame.get() < b.from.frame.get();
+	}
+
+	if (a.from.metric && b.from.metric) {
+		return a.from.metric.get() < b.from.metric.get();
+	}
+
+	assert (false);
+}