Test for some required matrix constructors

dune/istl/test/bcrsmatrixtest.cc

@@ -25,6 +25,9 @@ int testBCRSMatrix(int size)
   // Test the matrix norms
   testNorms(mat);
 
+  // Test whether matrix class has the required constructors
+  testMatrixConstructibility<Matrix>();
+
   return 0;
 }
 

dune/istl/test/matrixtest.hh

@@ -20,6 +20,14 @@
 
 namespace Dune
 {
+  /** \brief Test whether the given type is default- and copy-constructible */
+  template <typename Matrix>
+  void testMatrixConstructibility()
+  {
+    static_assert(std::is_default_constructible<Matrix>::value, "Matrix type is not default constructible");
+    static_assert(std::is_copy_constructible<Matrix>::value, "Matrix type is not copy constructible");
+  }
+
   /** \brief Test whether a given type implements all the norms required from a dune-istl matrix
    */
   template <typename Matrix>