From b6893c9c6a97ef44d175a908c64a78e18f7903d7 Mon Sep 17 00:00:00 2001
From: Holger Kohr <h.kohr@cwi.nl>
Date: Sat, 21 Oct 2017 23:13:12 +0200
Subject: [PATCH] BUG: fix in-out aliasing issue in OperatorSum, closes #1181

---
 odl/operator/operator.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/odl/operator/operator.py b/odl/operator/operator.py
index 1bd9c72d7e6..31beeafd205 100644
--- a/odl/operator/operator.py
+++ b/odl/operator/operator.py
@@ -1156,8 +1156,8 @@ def _call(self, x, out=None):
         else:
             tmp = (self.__tmp_ran if self.__tmp_ran is not None
                    else self.range.element())
-            self.left(x, out=out)
-            self.right(x, out=tmp)
+            self.left(x, out=tmp)
+            self.right(x, out=out)
             out += tmp
 
     def derivative(self, x):