void iMesh_getNumOfType(iMesh_Instance instance,
			/*in*/ const iBase_EntitySetHandle entity_set_handle,
			/*in*/ const int entity_type,
			int *num_type, int *err)
{
  *err = iBase_SUCCESS;
  // Get an actual instance pointer 
  iMesh_GRUMMP *pMG = reinterpret_cast<iMesh_GRUMMP*>(instance);
  CHECK_FOR_MESH_DATA(pMG, err);
  // Confirm that the entity_set_handle is valid.  This macro will have
  // to be extended to check part handles, too.
  CHECK_ENTITY_SET(pMG, entity_set_handle, err);
  
    // End additional code
    if (entity_set_handle == &(pMG->pVM)) {
    // The case for the entire mesh
    // Code to do the actual work deleted.  Case statement involved.
  }
  else {
    // Have a part handle or set handle
    // The following block will have to be added compared with existing
    // code 
    iBase_EntitySetHandle actual_set_handle = entity_set_handle;
    if (entity_set_handle & 1) {
      // Part handle
      actual_set_handle = // look it up; probably an inline micro
			  // function for maintainability.
    }
    // End of additional code.
    // Have an actual entity set argument
    // Code to do the actual work deleted.  Case statement again.
  }
}