[assembler.system] fixed warnings

dune/detailed/discretizations/assembler/system.hh

@@ -417,7 +417,7 @@ public:
   void addLocalAssembler(const LocalAssembler::Codim0Vector<L>& localAssembler,
                          Dune::Stuff::LA::VectorInterface<V>& vector)
   {
-    assert(vector.size() == int(testSpace_.mapper().size()));
+    assert(vector.size() == testSpace_.mapper().size());
     localCodim0VectorAssemblers_.push_back(new LocalCodim0VectorAssemblerWrapper<L, V>(localAssembler, vector));
   }
 
@@ -527,6 +527,9 @@ private:
   class LocalConstraintsApplication
   {
   public:
+    virtual ~LocalConstraintsApplication()
+    {
+    }
     virtual void apply(const TestSpaceType& testSpace, const EntityType& entity) = 0;
   };