Initialize pointer members

Except shared pointers, which are automatically initialised to zero.

dune/solvers/iterationsteps/iterationstep.hh

@@ -19,8 +19,9 @@ class IterationStep : virtual public NumProc, public CanIgnore<BitVectorType>
         typedef BitVectorType BitVector;
 
         //! Default constructor
-        IterationStep()
-        {}
+        IterationStep() {
+          x_ = nullptr;
+        }
 
         /** \brief Destructor */
         virtual ~IterationStep() {}

dune/solvers/iterationsteps/lineariterationstep.hh

@@ -24,7 +24,9 @@ class LinearIterationStep : public IterationStep<VectorType, BitVectorType>,
 public:
 
     //! Default constructor
-    LinearIterationStep() {}
+    LinearIterationStep() {
+        rhs_ = nullptr;
+    }
 
     /** \brief Destructor */
     virtual ~LinearIterationStep() {}