ConeTools.h

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#ifndef RecoTauTag_RecoTau_ConeTools_h
#define RecoTauTag_RecoTau_ConeTools_h

#include "DataFormats/Math/interface/deltaR.h"
#include <boost/iterator/filter_iterator.hpp>
#include "DataFormats/TauReco/interface/PFTau.h"
#include "DataFormats/TauReco/interface/PFRecoTauChargedHadron.h"
#include "DataFormats/TauReco/interface/RecoTauPiZero.h"
#include <functional>

namespace reco { namespace tau { namespace cone {

// Predicate class that tests if a candidate lies within some deltaR (min,
// max) about a supplied axis
template<class CandType>
class DeltaRFilter : public std::unary_function<CandType, bool> {
  public:
    DeltaRFilter(const reco::Candidate::LorentzVector& axis, double min, double max)
      : eta_(axis.eta()),
        phi_(axis.phi()),
        min2_(min < 0. ? -min*min : min*min),
        max2_(max*max) 
    {}
    bool operator()(const CandType& b) const 
    {
      double dR2 = deltaR2(b.eta(), b.phi(), eta_, phi_);
      return (dR2 >= min2_ && dR2 < max2_);
    }
  private:
    double eta_;
    double phi_;
    const double min2_;
    const double max2_;
};

// Wrapper around DeltaRFilter to support reference types like Ptr<>
template<class CandType>
class DeltaRPtrFilter : public std::unary_function<CandType, bool> {
  public:
    DeltaRPtrFilter(const reco::Candidate::LorentzVector& axis,
                    double min, double max): filter_(axis, min, max) {}
    bool operator()(const CandType& b) const { return filter_(*b); }
  private:
    DeltaRFilter<typename CandType::value_type> filter_;
};

/* Define our filters */
typedef DeltaRPtrFilter<PFCandidatePtr> PFCandPtrDRFilter;
typedef boost::filter_iterator< PFCandPtrDRFilter,
        std::vector<PFCandidatePtr>::const_iterator> PFCandPtrDRFilterIter;

typedef DeltaRFilter<PFRecoTauChargedHadron> ChargedHadronDRFilter;
typedef boost::filter_iterator< ChargedHadronDRFilter,
        std::vector<PFRecoTauChargedHadron>::const_iterator> ChargedHadronDRFilterIter;

typedef DeltaRFilter<RecoTauPiZero> PiZeroDRFilter;
typedef boost::filter_iterator< PiZeroDRFilter,
        std::vector<RecoTauPiZero>::const_iterator> PiZeroDRFilterIter;

}}}  // end namespace reco::tau::cone

#endif