Avoid warning regarding uninitialized variable

diff --git a/include/deal.II/lac/tensor_product_matrix.h b/include/deal.II/lac/tensor_product_matrix.h
index 8734f694a2c8f09116064b32fd9b545655e5c675..14f7e023b161f8dd3c651a1e649a262131492dc4 100644 (file)
--- a/include/deal.II/lac/tensor_product_matrix.h
+++ b/include/deal.II/lac/tensor_product_matrix.h
@@ -341,7 +341,8 @@ namespace internal
           std::array<Table<2, Number>, dim> &      eigenvectors,
           std::array<AlignedVector<Number>, dim> & eigenvalues)
     {
-      const int n_rows_1d = mass_matrices[0].n_cols();
+      const unsigned int n_rows_1d = mass_matrices[0].n_cols();
+      (void)n_rows_1d;
 
       for (unsigned int dir = 0; dir < dim; ++dir)
         {
@@ -376,7 +377,7 @@ namespace internal
           std::array<Table<2, VectorizedArray<Number>>, dim> &eigenvectors,
           std::array<AlignedVector<VectorizedArray<Number>>, dim> &eigenvalues)
     {
-      const int              n_rows_1d   = mass_matrix[0].n_cols();
+      const unsigned int     n_rows_1d   = mass_matrix[0].n_cols();
       constexpr unsigned int macro_size  = VectorizedArray<Number>::size();
       const std::size_t nm_flat_size_max = n_rows_1d * n_rows_1d * macro_size;
       const std::size_t n_flat_size_max  = n_rows_1d * macro_size;