fix compiler warning in DiagonalMatrix

diff --git a/include/deal.II/lac/diagonal_matrix.h b/include/deal.II/lac/diagonal_matrix.h
index b30baffcbb3fb77b9a918125f53f1e2cd0e37b4a..1f5a62dc4a7982b62d37b389112f5dd7d7729a95 100644 (file)
--- a/include/deal.II/lac/diagonal_matrix.h
+++ b/include/deal.II/lac/diagonal_matrix.h
@@ -291,6 +291,7 @@ DiagonalMatrix<VectorType>::operator()(const size_type i,
                                        const size_type j)
 {
   Assert (i==j, ExcIndexRange(j,i,i+1));
+  (void)j;
   return diagonal(i);
 }