X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fposition.h;h=3c561d85c2b14b909b2f7e1fd2445bed662ff189;hb=769c71b5c3e050ccfc1c13771d24328fbf76a495;hp=f9bd0987cdb5ed3e2688ed63bf0d5cfdbbf1597d;hpb=98060a4e6f02b418f30b4b736e5880a357454c40;p=dcpomatic.git

diff --git a/src/lib/position.h b/src/lib/position.h
index f9bd0987c..3c561d85c 100644
--- a/src/lib/position.h
+++ b/src/lib/position.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2014 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
@@ -21,7 +21,7 @@
 #define DCPOMATIC_POSITION_H
 
 /** @struct Position
- *  @brief A position.
+ *  @brief A position (x and y coordinates)
  */
 template <class T>
 class Position
@@ -50,4 +50,25 @@ operator+ (Position<T> const & a, Position<T> const & b)
 	return Position<T> (a.x + b.x, a.y + b.y);
 }
 
+template<class T>
+Position<T>
+operator- (Position<T> const & a, Position<T> const & b)
+{
+	return Position<T> (a.x - b.x, a.y - b.y);
+}
+
+template<class T>
+bool
+operator== (Position<T> const & a, Position<T> const & b)
+{
+	return a.x == b.x && a.y == b.y;
+}
+
+template<class T>
+bool
+operator!= (Position<T> const & a, Position<T> const & b)
+{
+	return a.x != b.x || a.y != b.y;
+}
+
 #endif