Tracking/TrkEvent/VxVertex/VxVertex/PrimaryVertexSelector.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// PrimaryVertexSelector, (c) ATLAS Detector software
 
#ifndef TRKEVENTUTILS_PRIMARYVERTEXSELECTOR_H
#define TRKEVENTUTILS_PRIMARYVERTEXSELECTOR_H
 
//Trk
#include "VxVertex/VxContainer.h"
#include "VxVertex/VxCandidate.h"
 
inline const Trk::VxCandidate* PrimaryVertexSelector(const VxContainer& vxContainer){
    // the return vertex
    const Trk::VxCandidate* primaryVxCandidate = 0;
    // simple loop through and get the primary vertex
    VxContainer::const_iterator vxIter    = vxContainer.begin();
    VxContainer::const_iterator vxIterEnd = vxContainer.end();
    for ( size_t ivtx = 0; vxIter != vxIterEnd; ++vxIter, ++ivtx ){
       // the first and only primary vertex candidate is picked
       if ( (*vxIter)->vertexType() ==  Trk::PriVtx){
            primaryVxCandidate = (*vxIter);
            break;
        }
    }
    // return what you have - users need to check
    return primaryVxCandidate;
}
 
#endif