Add an overload suited to pointer arguments (primitive types).

src/CSRMatrixUmfpackSolver.hpp

@@ -42,6 +42,16 @@ namespace Opm {
     namespace ImplicitTransportLinAlgSupport {
         class CSRMatrixUmfpackSolver {
         public:
+            template <class Vector>
+            void
+            solve(const struct CSRMatrix* A,
+                  const Vector            b,
+                  Vector                  x) {
+
+                call_UMFPACK(const_cast<CSRMatrix*>(A),
+                             b, x);
+            }
+
             template <class Vector>
             void
             solve(const struct CSRMatrix& A,