virtual inheritance of ProblemTimeinterface in ProblemInstat

src/amdis/ProblemInstatBase.hpp

@@ -17,18 +17,20 @@ namespace AMDiS
    * Base class for \ref ProblemInstat.
    */
   class ProblemInstatBase
-      : public ProblemTimeInterface
+      : public virtual ProblemTimeInterface
   {
   public:
     /// Constructor.
     ProblemInstatBase(std::string const& name)
-      : name_(name)
+      : ProblemTimeInterface()
+      , name_(name)
     {}
 
     /// Constructor. Stores a pointer to the provided initialProblem.
     ProblemInstatBase(std::string const& name,
                       ProblemStatBase& initialProblem)
-      : name_(name)
+      : ProblemTimeInterface()
+      , name_(name)
       , initialProblem_(&initialProblem)
     {}