/data/refman/pasoursint/CMSSW_5_3_3/src/CommonTools/Utils/interface/PointerComparator.h

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#ifndef CommonTools_Utils_PointerComparator_h
#define CommonTools_Utils_PointerComparator_h

#include "FWCore/Utilities/interface/EDMException.h"

template<typename C>
struct PointerComparator {
  typedef typename C::first_argument_type first_argument_type;
  typedef typename C::second_argument_type second_argument_type;
    bool operator()( const first_argument_type * t1, const second_argument_type * t2 ) const {
      if ( t1 == 0 || t2 == 0 )
        throw edm::Exception( edm::errors::NullPointerError )
          << "PointerComparator: passed null pointer."; 
        return cmp( *t1, *t2 );
    }
  C cmp;
};


#endif