From: DerTopper@web.de   
      
   On 04/07/2013, DeMarcus wrote:   
   > PS. Never forget the virtual destructor in your interfaces, not even   
   > in examples. ;)   
      
   Chances ar high that OP uses his mix-in classes for MS COM   
   programming.  In that case the interfaces must not have virtual   
   destructors.   
      
   Regards,   
   Stuart   
      
      
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