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#ifndef IsolationUtils_TrkCalIsolationAlgo_h
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#define IsolationUtils_TrkCalIsolationAlgo_h
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#include "PhysicsTools/Utilities/interface/Math.h"
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template <typename T1, typename C2>
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class TrkCalIsolationAlgo {
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public:
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typedef double value_type;
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TrkCalIsolationAlgo( );
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TrkCalIsolationAlgo( double dRMin, double dRMax) : dRMin_( dRMin ), dRMax_( dRMax ) { }
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~TrkCalIsolationAlgo() { }
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double operator()(const T1 &, const C2 &) const;
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private:
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double dRMin_, dRMax_;
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};
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//This source (track) already has defined outer eta and phi.
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//This is the track's end point in the tracker, this should be close
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//the tracks entry into the calorimeter.
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//A specialized template operator () for tracks in the CalIsolationAlgo class is not
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//feasable, since the () operator cannot be overloaded.
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template <typename T1, typename C2> double TrkCalIsolationAlgo<T1,C2>::
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operator()(const T1 & cand, const C2 & elements) const {
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double etSum = 0;
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for( typename C2::const_iterator elem = elements.begin();
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elem != elements.end(); ++elem ) {
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double dR = deltaR( elem->eta(), elem->phi(),
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cand.outerEta(), cand.outerPhi() );
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if ( dR < dRMax_ && dR > dRMin_ ) {
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etSum += elem->et();
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}
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}
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return etSum;
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}
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#endif
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