TrackParametersCovarianceCnv.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
#ifndef TRKEVENTTPCNV_TRACKPARAMETERSCOVARIANCECNV_H
#define TRKEVENTTPCNV_TRACKPARAMETERSCOVARIANCECNV_H
 
 
#include "TrkParametersBase/ParametersBase.h"
 
template <typename PARMS>
class TrackParametersCovarianceCnv
{
public:
  static void setCovariance (PARMS* p,
                             const Trk::ErrorMatrix& mat);
};
 
 
template <typename PARMS>
void TrackParametersCovarianceCnv<PARMS>::setCovariance (PARMS* p,
                                                         const Trk::ErrorMatrix& mat)
{
   if (!p->m_covariance || p->m_covariance->size() != PARMS::dim) {
     p->m_covariance.emplace();
   }
   if (mat.values.size() == PARMS::dim*(PARMS::dim+1)/2){
     EigenHelpers::vectorToEigenMatrix(mat.values, *(p->m_covariance), "TrackParametersCovarianceCnv");
   }
   else if (mat.values.size() == 6) {
     auto& cov = *(p->m_covariance);
     cov.setZero();
     unsigned int pos = 0;
     for (unsigned int i=0; i < 3; i++)
       for (unsigned int j=0; j <= i; j++)
         cov.fillSymmetric (i, j, mat.values[pos++]);
   }
   else
     std::abort();
}
 
 
#endif // not TRKEVENTTPCNV_TRACKPARAMETERSCOVARIANCECNV_H