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#ifndef MatchLessByDEta_h_
#define MatchLessByDEta_h_
/** Provides the less operator for two pairs of matched objects based
* on deltaEta. */
#include "FWCore/ParameterSet/interface/ParameterSet.h"
namespace reco {
template <typename C1, typename C2>
struct MatchLessByDEta {
public:
MatchLessByDEta(const edm::ParameterSet& cfg, const C1& c1, const C2& c2) : c1_(c1), c2_(c2) {}
bool operator()(const std::pair<size_t, size_t>& p1, const std::pair<size_t, size_t>& p2) const {
typedef typename C1::value_type T1;
typedef typename C2::value_type T2;
const T1& p1_1 = c1_[p1.first];
const T2& p1_2 = c2_[p1.second];
const T1& p2_1 = c1_[p2.first];
const T2& p2_2 = c2_[p2.second];
if (fabs(p1_1.eta() - p1_2.eta()) < fabs(p2_1.eta() - p2_2.eta()))
return true;
return false;
}
private:
const C1& c1_;
const C2& c2_;
};
} // namespace reco
#endif
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