In This Package:

HistoryKeeper.cc

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#include "HistoryKeeper.h"

StatusCode HistoryKeeper::queryInterface( const InterfaceID& riid, void** ppvInterface ) 
{
  // chech the placeholder for result 
  if ( !ppvInterface ) { return StatusCode::FAILURE ; }
  //
  *ppvInterface = 0;
  //
  if ( riid == IHistoryKeeper::interfaceID() ) 
  {
    *ppvInterface = static_cast<IHistoryKeeper*>(this);
    addRef();                
    return StatusCode::SUCCESS ;    
  }
  //
  return  Service::queryInterface( riid, ppvInterface ) ; 
}

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