[parallel] force the gathered information to be of type int

This fixes a compilation error encountered with YaspGrid and the Dune
master. Since the return type of mappers has been generalized, an
implicit conversion to int does not happen anymore.

Reviewed by gruenich.


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@13479 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/linear/vertexborderlistfromgrid.hh

@@ -81,7 +81,7 @@ public:
     void gather(MessageBufferImp &buff, const EntityType &e) const
     {
         buff.write(gridView_.comm().rank());
-        buff.write(map_.map(e));
+        buff.write(static_cast<int>(map_.map(e)));
     }
 
     template<class MessageBufferImp, class EntityType>