uuuaahsvn diff operators/sumoperator.hh missing 'return' statement; why the...

uuuaahsvn diff operators/sumoperator.hh  missing 'return' statement; why the hell doesn't the compiler warn about it and produce actually working code when no optimization is done

[[Imported from SVN: r5795]]

dune/solvers/operators/sumoperator.hh

@@ -67,13 +67,13 @@ class SumOperator
         //! return the number of rows
         const size_t N() const
         {
-            sparse_matrix_->N();
+            return sparse_matrix_->N();
         }
 
         //! return the number of columns
         const size_t M() const
         {
-            sparse_matrix_->M();
+            return sparse_matrix_->M();
         }
 
         //! return one summand