MakeOwnCopy problem

[John Hall]

Gang:
In FieldEngine.h, the routine makeOwnCopy references a "model" which 
doesn't exist. I changed it locally to s.fieldEngine().data(m,c) 
which compiles and links and seems to make sense to me.

Could someone else take a look at it and tell me what the right thing to do is?

   //---------------------------------------------------------------------------
   // Make a distinct copy of this fieldEngineBase.

   template<class Subject>
   void makeOwnCopy(const Subject &s)
   {
     PAssert(data_m.isValid());

     // Create a blank slate of engines:

     data_m = RefCountedBlockPtr<Data_t>();
     stride_m = centering_m.size();
     addSubFields();

     // Copy then engines and relations and
     // Deepen the copies of the engine & relations list.

     for (int m = 0; m < num_materials_m; ++m)
     {
       for (int c = 0; c < centering_m.size(); ++ c)
       {
         data(m, c) = model.data(m, c); // This is THE LINE in question
         data(m, c).engine().makeOwnCopy();
         data(m, c).relations().makeOwnCopy(s);
       }
     }
   }

Thanks,
John Hall

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