[Dune] [#849] YaspGrid creates entities of unsupported codimension in communicate()

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The following task has a new comment added:

FS#849 - YaspGrid creates entities of unsupported codimension in communicate()
User who did this - Robert Klöfkorn (robertk)

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Hi Steffen, I can into the same problem years ago. The best way would be to implement higher codim entities in Yasp, which should not be difficult. A quick fix would be methods gather and scatter on your data handle that 
only do something for codim = 0 and codim = dim and that are empty for the other codims. 

  template <class MessageBufferImp, class EntityType, int codim>
  struct HandleData
  {
    static void gather (MessageBufferImp& buff, const EntityType& en) {} 
  };

  template <class MessageBufferImp, class EntityType>
  struct HandleData<MessageBufferImp,EntityType,0>
  {
    //! gather data 
    static void gather (MessageBufferImp& buff, const EntityType& en)
    {
      // gather data 
    }
  };

Anyway, having higher codim entities would be much better.

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