From cc77c50e59e9e3e4d5394d5fcf6905372fb7fe86 Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Fri, 10 Aug 2012 13:05:24 +0200
Subject: [PATCH] added -= operators for Point/Vector

---
 src/geometry/operators.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/geometry/operators.h b/src/geometry/operators.h
index 2dfa54e..295daa1 100644
--- a/src/geometry/operators.h
+++ b/src/geometry/operators.h
@@ -26,13 +26,11 @@ inline Point<T> operator +(const Point<T> &lhs, const Vector<T> &rhs) {
 
 template<class T>
 inline Vector<T> &operator +=(Vector<T> &lhs, const Vector<T> &rhs) {
-	lhs = lhs + rhs;
-	return lhs;
+	return lhs = lhs + rhs;
 }
 template<class T>
 inline Point<T> &operator +=(Point<T> &lhs, const Vector<T> &rhs) {
-	lhs = lhs + rhs;
-	return lhs;
+	return lhs = lhs + rhs;
 }
 
 template<class T>
@@ -44,6 +42,15 @@ inline Point<T> operator -(const Point<T> &lhs, const Vector<T> &rhs) {
 	return Point<T>(lhs.X() - rhs.X(), lhs.Y() - rhs.Y());
 }
 
+template<class T>
+inline Vector<T> &operator -=(Vector<T> &lhs, const Vector<T> &rhs) {
+	return lhs = lhs - rhs;
+}
+template<class T>
+inline Point<T> &operator -=(Point<T> &lhs, const Vector<T> &rhs) {
+	return lhs = lhs - rhs;
+}
+
 template<class T>
 inline Vector<T> operator -(const Vector<T> &v) {
 	return Vector<T>(-v.X(), -v.Y());
-- 
2.39.2