--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/assertType.m	Mon Sep 11 14:17:15 2017 +0200
@@ -0,0 +1,11 @@
+function assertType(obj, type)
+    if ~iscell(type)
+        if ~isa(obj, type)
+            error('sbplib:assertType:wrongType', '"%s" must have type "%s", found "%s"', inputname(1), type, class(obj));
+        end
+    else
+        if ~isAnyOf(obj, type)
+            error('sbplib:assertType:wrongType', '"%s" must be one of the types %s, found "%s"', inputname(1), toString(type), class(obj));
+        end
+    end
+end