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#ifndef CommonTools_Utils_PointerComparator_h
#define CommonTools_Utils_PointerComparator_h
/** \class PoinetComparator
*
* adapt a comparator to take pointers as arguments
*
* \author Luca Lista, INFN
*
* \version $Revision: 1.1 $
*
* $Id: PointerComparator.h,v 1.1 2007/04/23 20:43:09 llista Exp $
*
*/
#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 == nullptr || t2 == nullptr)
throw edm::Exception(edm::errors::NullPointerError) << "PointerComparator: passed null pointer.";
return cmp(*t1, *t2);
}
C cmp;
};
#endif
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