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