[discretization] replace typedef by using

dumux/discretization/cellcentered/mpfa/interactionvolumebase.hh

@@ -37,7 +37,7 @@ namespace Dumux
  * \brief Base class for the interaction volume traits. The types stated here
  *        have to be defined in interaction volume traits. It is recommended
  *        that different implementations inherit from this class and overwrite the
- *        desired types or publicly state the typedef of this base class.
+ *        desired types or publicly state the types of this base class.
  */
 template<class TypeTag>
 class CCMpfaInteractionVolumeTraitsBase

dumux/discretization/cellcentered/tpfa/properties.hh

@@ -132,7 +132,7 @@ private:
         using BoundaryFlag = Dumux::BoundaryFlag<Grid>;
     };
 public:
-    typedef Dumux::CCTpfaSubControlVolumeFace<ScvfGeometryTraits> type;
+    using type = Dumux::CCTpfaSubControlVolumeFace<ScvfGeometryTraits>;
 };
 
 //! Set the solution vector type for an element

dumux/discretization/staggered/properties.hh

@@ -196,7 +196,7 @@ private:
     using CellCenterSolutionVector = typename GET_PROP_TYPE(TypeTag, CellCenterSolutionVector);
     using FaceSolutionVector = typename GET_PROP_TYPE(TypeTag, FaceSolutionVector);
 public:
-    typedef typename Dune::MultiTypeBlockVector<CellCenterSolutionVector, FaceSolutionVector> type;
+    using type = Dune::MultiTypeBlockVector<CellCenterSolutionVector, FaceSolutionVector>;
 };
 
 //! Set the type of a global jacobian matrix from the solution types TODO: move to LinearAlgebra traits