Index: libcfa/src/containers/array.hfa
===================================================================
--- libcfa/src/containers/array.hfa	(revision 7a1b7e6a157634659c964c35fb6d02e8863a955a)
+++ libcfa/src/containers/array.hfa	(revision 05e33f580e073ce7dbf83ff0dbf8522b4353e116)
@@ -1,2 +1,3 @@
+#include <assert.h>
 
 
@@ -34,16 +35,20 @@
 
     static inline Timmed & ?[?]( arpk(N, S, Timmed, Tbase) & a, int i ) {
+        assert( i < N );
         return (Timmed &) a.strides[i];
     }
 
     static inline Timmed & ?[?]( arpk(N, S, Timmed, Tbase) & a, unsigned int i ) {
+        assert( i < N );
         return (Timmed &) a.strides[i];
     }
 
     static inline Timmed & ?[?]( arpk(N, S, Timmed, Tbase) & a, long int i ) {
+        assert( i < N );
         return (Timmed &) a.strides[i];
     }
 
     static inline Timmed & ?[?]( arpk(N, S, Timmed, Tbase) & a, unsigned long int i ) {
+        assert( i < N );
         return (Timmed &) a.strides[i];
     }