Parallel grid port to master additions

dune/grid/common/metagriddatahandle.hh

@@ -59,7 +59,7 @@ namespace Dune
   // ----------------------
 
 #if HAVE_DUNE_ALUGRID
-  template< class WrappedHandle, bool = std::is_base_of< LoadBalanceHandleWithReserveAndCompress, WrappedHandle >::value >
+  template< class WrappedHandle, bool = std::is_base_of_v<LoadBalanceHandleWithReserveAndCompress, WrappedHandle> >
   struct MetaGridDataHandleBase;
 
   template< class WrappedHandle >
@@ -111,7 +111,7 @@ namespace Dune
     typedef MetaGridDataHandleBase< WrappedHandle > Base;
 
     // type of traits
-    typedef typename std::remove_const< GridFamily >::type::Traits Traits;
+    typedef typename std::remove_const_t<GridFamily>::Traits Traits;
 
     // type of extra data
     typedef typename Traits :: ExtraData ExtraData ;
@@ -210,7 +210,7 @@ namespace Dune
   template< class WrappedDofManager, class GridFamily, class Filter = MetaGridNoFilter >
   class MetaGridWrappedDofManager
   {
-    typedef typename std::remove_const< GridFamily >::type::Traits Traits;
+    typedef typename std::remove_const_t<GridFamily>::Traits Traits;
     // type of extra data
     typedef typename Traits :: ExtraData ExtraData ;
     // type of host element (i.e. codim = 0)