IGlobalTrackFitter.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/

// IGlobalTrackFitter.h
//   Header file for interface of global-least-squares track fitters
// (c) ATLAS Detector software
// Thijs.Cornelissen at cern.ch, Wolfgang.Liebig at cern.ch
#ifndef TRK_IGLOBALTRACKFITTER_H
#define TRK_IGLOBALTRACKFITTER_H
 
#include "TrkFitterInterfaces/ITrackFitter.h"
#include "TrkParameters/TrackParameters.h"
#include "EventPrimitives/EventPrimitives.h"
#include <memory>
//
//class HepMatrix; class HepSymMatrix;
 
namespace Trk {

    class IGlobalTrackFitter : virtual public ITrackFitter {
 
 
    friend class ShiftingDerivCalcTool;
    friend class Chi2DerivCalcTool;
 
  public:
 
    struct AlignmentCache{

      std::unique_ptr<Amg::MatrixX> m_derivMatrix;

      std::unique_ptr<Amg::MatrixX> m_fullCovarianceMatrix;

     int m_iterationsOfLastFit  = 1;
     int m_minIterations = 0;
 
     ~AlignmentCache() = default;
 
    };

    virtual Track* alignmentFit( AlignmentCache&,
                        const Track&,
                        const RunOutlierRemoval  runOutlier=false,
                        const ParticleHypothesis matEffects=Trk::nonInteracting) const = 0;
 
  };
}
 
#endif