From: darylew@googlemail.com   
      
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   Inside the definition of a non-static member function, you can refer to   
   the object currently in play with:   
      
       MyClass cv * const  this = /* The current object's address */;   
      
   Where "cv" is the const and/or volatile status you added to the head of   
   the function.  You cannot change the value of "this," but you can alter   
   the object it points to (or its sub-objects) if "cv" doesn't include   
   "const," and/or the computer can change the (sub-)object(s) behind your   
   back if "cv" includes "volatile."   
      
   Referring to non-static member data within the method will add "cv" to   
   its qualification before you can mess with it.  If the data member is a   
   reference, the qualification is applied to the type behind the   
   reference.  For pointers, the pointer as itself is qualified, but what   
   it points to doesn't change its qualification.   
      
   If you call a non-static member function, you're restricted to the ones with   
   the same qualification or harsher.  For example, a "const" method cannot   
   call a bare method, but it can call other "const" methods or "const volatile"   
   methods.  You can get around this by messing with "const_cast."   
      
   Daryle W.   
      
      
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