--- linuxsampler/trunk/src/scriptvm/CoreVMFunctions.cpp	2017/08/02 10:39:46	3344
+++ linuxsampler/trunk/src/scriptvm/CoreVMFunctions.cpp	2017/08/10 13:18:06	3345
@@ -429,6 +429,14 @@
         --m_index;
         return it;
     }
+    inline ArrExprIter& operator+=(difference_type d) {
+        m_index += d;
+        return *this;
+    }
+    inline ArrExprIter& operator-=(difference_type d) {
+        m_index -= d;
+        return *this;
+    }
     inline bool operator==(const ArrExprIter& other) const {
         return m_index == other.m_index;
     }