Merge branch 'issue/quad_factory' into 'master'

repair quadfactory storage

See merge request !206

amdis/GridFunctionOperator.hpp

@@ -82,7 +82,7 @@ namespace AMDiS
     void setQuadFactory(PQF&& pre)
     {
       using ctype = typename Geometry::ctype;
-      quadFactory_.emplace(
+      quadFactory_ = makeUniquePtr(
         makeQuadratureFactory<ctype, LC::mydimension, LocalFunction>(FWD(pre)));
     }
 
@@ -137,7 +137,7 @@ namespace AMDiS
     std::optional<LocalFunction> localFct_;
 
     /// Assign each element type a quadrature rule
-    std::optional<QuadFactory> quadFactory_;
+    std::shared_ptr<QuadFactory> quadFactory_;
 
     /// the derivative order of this operator (in {0, 1, 2})
     int termOrder_ = 0;