Article # 148, added by Geoworks, historical record
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When to use ObjDerefGen/ObjDerefVis




pself is automatically set to point to an object's instance data
at the start of a method handler (except as noted below).  There
are conditions when you will need to re-dereference pself in the
method handler.  These conditions are:

+ You need to redereference after calling any message and after
  @callsuper.

+ If the class is a master or variant (has either keyword in the
  class definition), then you need to dereference pself at the
  beginning of the method.  (If your class is a subclass of a 
  standard Geos class, then you do not need to dereference at 
  the beginning.)