/data/refman/pasoursint/CMSSW_5_3_4/src/RecoVertex/PrimaryVertexProducer/interface/DAClusterizerInZ_vect.h

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#ifndef DAClusterizerInZ_vect_h
#define DAClusterizerInZ_vect_h

#include "RecoVertex/PrimaryVertexProducer/interface/TrackClusterizerInZ.h"
#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include <vector>
#include "DataFormats/Math/interface/Error.h"
#include "RecoVertex/VertexTools/interface/VertexDistanceXY.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"

#include "DataFormats/Math/interface/VDTMath.h"

// this class uses the C++11 standard
#ifdef __GXX_EXPERIMENTAL_CXX0X__
class DAClusterizerInZ_vect: public TrackClusterizerInZ {

public:
        // Internal data structure to 
        struct track_t {

                void AddItem( double new_z, double new_dz2, const reco::TransientTrack* new_tt, double new_pi   )
                {
                        z.push_back( new_z );
                        dz2.push_back( new_dz2 );
                        tt.push_back( new_tt );

                        pi.push_back( new_pi ); // track weight
                        Z_sum.push_back( 1.0); // Z[i]   for DA clustering, initial value as done in ::fill
                }



                unsigned int GetSize() const
                {
                        return z.size();
                }


                // has to be called everytime the items are modified
                void ExtractRaw()
                {
                        _z = &z.front();
                        _dz2 = &dz2.front();
                        _Z_sum = &Z_sum.front();
                        _pi = &pi.front();
                }

                double * __restrict__ _z; // z-coordinate at point of closest approach to the beamline
                double * __restrict__  _dz2; // square of the error of z(pca)

                double * __restrict__  _Z_sum; // Z[i]   for DA clustering
                double * __restrict__  _pi; // track weight

                std::vector<double> z; // z-coordinate at point of closest approach to the beamline
                std::vector<double> dz2; // square of the error of z(pca)
                std::vector< const reco::TransientTrack* > tt; // a pointer to the Transient Track

                std::vector<double> Z_sum; // Z[i]   for DA clustering
                std::vector<double> pi; // track weight
        };

        struct vertex_t {
                std::vector<double> z; //           z coordinate
                std::vector<double> pk; //           vertex weight for "constrained" clustering

                // --- temporary numbers, used during update
                std::vector<double> ei_cache;
                std::vector<double> ei;
                std::vector<double> sw;
                std::vector<double> swz;
                std::vector<double> se;
                std::vector<double> swE;


                unsigned int GetSize() const
                {
                        return z.size();
                }

                void AddItem( double new_z, double new_pk   )
                {
                        z.push_back( new_z);
                        pk.push_back( new_pk);

                        ei_cache.push_back( 0.0 );
                        ei.push_back( 0.0 );
                        sw.push_back( 0.0 );
                        swz.push_back( 0.0);
                        se.push_back( 0.0);
                        swE.push_back( 0.0);

                        ExtractRaw();
                }

                void InsertItem( unsigned int i, double new_z, double new_pk   )
                {
                        z.insert(z.begin() + i, new_z);
                        pk.insert(pk.begin() + i, new_pk);

                        ei_cache.insert(ei_cache.begin() + i, 0.0 );
                        ei.insert( ei.begin()  + i, 0.0 );
                        sw.insert( sw.begin()  + i, 0.0 );
                        swz.insert(swz.begin() + i, 0.0 );
                        se.insert( se.begin()  + i, 0.0 );
                        swE.insert(swE.begin() + i, 0.0 );

                        ExtractRaw();
                }

                void RemoveItem( unsigned int i )
                {
                        z.erase( z.begin() + i );
                        pk.erase( pk.begin() + i );

                        ei_cache.erase( ei_cache.begin() + i);
                        ei.erase( ei.begin() + i);
                        sw.erase( sw.begin() + i);
                        swz.erase( swz.begin() + i);
                        se.erase(se.begin() + i);
                        swE.erase(swE.begin() + i);

                        ExtractRaw();
                }

                void DebugOut()
                {
                        std::cout <<  "vertex_t size: " << GetSize() << std::endl;

                        for ( unsigned int i =0; i < GetSize(); ++ i)
                        {
                                std::cout << " z = " << _z[i] << " pk = " << _pk[i] << std::endl;
                        }
                }

                // has to be called everytime the items are modified
                void ExtractRaw()
                {
                        _z = &z.front();
                        _pk = &pk.front();

                        _ei = &ei.front();
                        _sw = &sw.front();
                        _swz = &swz.front();
                        _se = &se.front();
                        _swE = &swE.front();
                        _ei_cache = &ei_cache.front();

                }

                double * __restrict__ _z;
                double * __restrict__ _pk;

                double * __restrict__ _ei_cache;
                double * __restrict__ _ei;
                double * __restrict__ _sw;
                double * __restrict__ _swz;
                double * __restrict__ _se;
                double * __restrict__ _swE;

        };

        DAClusterizerInZ_vect(const edm::ParameterSet& conf);


        std::vector<std::vector<reco::TransientTrack> >
        clusterize(const std::vector<reco::TransientTrack> & tracks) const;


        std::vector<TransientVertex>
        vertices(const std::vector<reco::TransientTrack> & tracks,
                        const int verbosity = 0) const
                        CMS_VECTORIZE ;

        track_t fill(const std::vector<reco::TransientTrack> & tracks) const;

        double update(double beta, track_t & gtracks,
                        vertex_t & gvertices, bool useRho0, double & rho0) const
                        CMS_VECTORIZE ;

        void dump(const double beta, const vertex_t & y,
                        const track_t & tks, const int verbosity = 0) const;
        bool merge(vertex_t &) const;
        bool merge(vertex_t & y, double & beta)const;
        bool purge(vertex_t &, track_t &, double &,
                        const double) const;

        void splitAll( vertex_t & y) const;
        bool split(const double beta,  track_t &t, vertex_t & y ) const;

        double beta0(const double betamax, track_t & tks, vertex_t & y) const;

        double Eik( double const& t_z, double const& k_z, double const& t_dz2) const;

        inline double local_exp( double const& inp) const;
        inline void local_exp_list( double* arg_inp, double* arg_out,const int arg_arr_size) const;

private:
        bool verbose_;
        float vertexSize_;
        int maxIterations_;
        double coolingFactor_;
        float betamax_;
        float betastop_;
        double dzCutOff_;
        double d0CutOff_;
        bool use_vdt_;
        bool useTc_;
};

// #ifdef __GXX_EXPERIMENTAL_CXX0X__
#endif

//#ifndef DAClusterizerInZ_new_h
#endif