MEMPROXY_CLASS and virtual methods and cbdata class's

saw this comment today..
 // reset should not reset the protocol; could have made protoPrefix a
 // virtual function instead, but it is not clear whether virtual
methods
 // are allowed with MEMPROXY_CLASS() and whether some cbdata void*
 // conversions are not going to kill virtual tables

virtual methods work file with MEMPROXY_CLASS.
casting to void * always gets the base address of the struct based on
the type that is being looked at AIUI.

I.e. if you have an HttpReply and cast to void * you might get a
different address than casting a HttpMsg to void * - but in practice
they are only ever different if there is multiple inheritance in place.

Rob

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