Merge branch 'issue/problem_instat_oldsolution' into 'develop'

cleanup oldSolution in ProblemInstat, so that it can be used in expressions...

See merge request !95

src/amdis/ProblemInstat.hpp

@@ -53,28 +53,20 @@ namespace AMDiS
     ProblemType&       problemStat()       { return *problemStat_; }
     ProblemType const& problemStat() const { return *problemStat_; }
 
-    /// Returns \ref oldSolution.
+    /// Returns const-ref of \ref oldSolution.
     SystemVector const& oldSolutionVector() const
     {
-      test_exit_dbg(oldSolution_,
+      test_exit_dbg(bool(oldSolution_),
         "OldSolution need to be created. Call initialize with INIT_UH_OLD.");
       return *oldSolution_;
     }
 
-    /// Return a mutable view to a oldSolution component
-    template <class TreePath = RootTreePath>
-    auto oldSolution(TreePath path = {})
-    {
-      auto&& tp = makeTreePath(path);
-      return makeDOFVectorView(oldSolutionVector(), tp);
-    }
-
     /// Return a const view to a oldSolution component
     template <class TreePath = RootTreePath>
     auto oldSolution(TreePath path = {}) const
     {
       auto&& tp = makeTreePath(path);
-      return makeDOFVectorView(oldSolutionVector(), tp);
+      return makeDiscreteFunction(oldSolutionVector(), tp);
     }
 
     /// Implementation of \ref ProblemTimeInterface::transferInitialSolution().

src/amdis/ProblemInstat.inc.hpp

@@ -45,7 +45,7 @@ void ProblemInstat<Traits>::createUhOld()
   if (oldSolution_)
     warning("oldSolution already created\n");
   else // create oldSolution
-    oldSolution_.reset(new SystemVector(problemStat_->globalBasis()));
+    oldSolution_.reset(new SystemVector(problemStat_->globalBasis(), INTERPOLATE));
 }