fix clang warnings

git-svn-id: https://svn.dealii.org/trunk@31751 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/include/deal.II/base/derivative_form.h b/deal.II/include/deal.II/base/derivative_form.h
index 87ef8c844dca74e32a8e276f9cd410677c943b99..4f12b6389ef51914158ae36dd4ad855cde6c8aa7 100644 (file)
--- a/deal.II/include/deal.II/base/derivative_form.h
+++ b/deal.II/include/deal.II/base/derivative_form.h
@@ -178,9 +178,9 @@ DerivativeForm<order, dim, spacedim>::DerivativeForm(const Tensor<2,dim> &T)
 {
   Assert( (dim == spacedim) && (order==1),
           ExcMessage("Only allowed for square tensors."));
-
-  for (unsigned int j=0; j<dim; ++j)
-    (*this)[j] = T[j];
+  if ((dim == spacedim) && (order==1))
+    for (unsigned int j=0; j<dim; ++j)
+      (*this)[j] = T[j];
 }