Expose static size and value type

diff --git a/include/deal.II/lac/tensor_product_matrix.h b/include/deal.II/lac/tensor_product_matrix.h
index ffab3f43be54864b8276904bf93112017220b1e3..8c9877bd615b434e366837f38982ae10a4819baa 100644 (file)
--- a/include/deal.II/lac/tensor_product_matrix.h
+++ b/include/deal.II/lac/tensor_product_matrix.h
@@ -74,6 +74,17 @@ template <int dim, typename Number, int size = -1>
 class TensorProductMatrixSymmetricSumBase
 {
 public:
+  /**
+   * Type of matrix entries. This alias is analogous to <tt>value_type</tt>
+   * in the standard library containers.
+   */
+  using value_type = Number;
+
+  /**
+   * Compile-time array lengths given by the template parameter size.
+   */
+  static constexpr int static_size = size;
+
   /**
    * Return the number of rows of the tensor product matrix
    * resulting from the Kronecker product of 1D matrices, which is described