G4DNAPolyNucleotideReactionProcess.hh

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/// file: G4DNAPolyNucleotideReactionProcess.hh
/// brief: This file handls reaction process with DNA geometry.
#ifndef G4DNAPolyNucleotideReactionProcess_hh
#define G4DNAPolyNucleotideReactionProcess_hh
#include <CLHEP/Units/SystemOfUnits.h>
#include "G4VITDiscreteProcess.hh"
#include <variant>
class G4DNAMolecularReactionTable;
class G4DNAComponentNode;
class G4VDNAHitModel;
 
class G4DNAPolyNucleotideReactionProcess : public G4VITDiscreteProcess
{
 public:
  explicit G4DNAPolyNucleotideReactionProcess(
    const G4String& aName = "DNAStaticMoleculeReactionProcess",
    G4int verbosityLevel  = 0);
  ~G4DNAPolyNucleotideReactionProcess() override;
  
  G4DNAPolyNucleotideReactionProcess(const G4DNAPolyNucleotideReactionProcess&) = delete;
  G4DNAPolyNucleotideReactionProcess& operator =(
    const G4DNAPolyNucleotideReactionProcess&) = delete;
 
  inline void SetDNADamageReactionModel(G4VDNAHitModel* pModel);
 
  G4bool IsApplicable(const G4ParticleDefinition&) override { return true; }
 
  G4double CalculateTimeStep(const G4Track& trackA,
                             const G4double& userTimeStep = 0);
 
  void StartTracking(G4Track* aTrack) override;
 
  G4double PostStepGetPhysicalInteractionLength(
    const G4Track&,  // track
    G4double,        // previousStepSize
    G4ForceCondition* pForceCond) override;
  G4VParticleChange* PostStepDoIt(const G4Track& track, const G4Step&) override;
 
  G4double GetMeanFreePath(const G4Track&, G4double, G4ForceCondition*) override
  {
    return DBL_MAX;
  }
 
  inline void SetVerbose(G4int verbose);
 
 protected:
  G4VParticleChange fParticleChange;
 
 private:
  struct G4PolyNucleotideReactionState
    : public G4ProcessStateBase<G4PolyNucleotideReactionState>
  {
    G4PolyNucleotideReactionState();
    ~G4PolyNucleotideReactionState() override = default;
    G4String GetType() override { return "PolyNucleotideReactionState"; }
 
    using DNANode =
      std::variant<const G4DNAComponentNode*, /*for dnadamage chain*/
                   const G4VPhysicalVolume* /*for molecularDNA chain*/>;
    DNANode fNodeReactant;
    G4double fSampledMinTimeStep;
    G4double fPreviousTimeAtPreStepPoint;
  };
  G4bool fHasAlreadyReachedNullTime{false};
  G4int fVerbose;
  G4double fRCutOff;
  G4VDNAHitModel* fpDamageModel{nullptr};
};
inline void G4DNAPolyNucleotideReactionProcess::SetVerbose(G4int verbose)
{
  fVerbose = verbose;
}
 
inline void G4DNAPolyNucleotideReactionProcess::SetDNADamageReactionModel(
  G4VDNAHitModel* pModel)
{
  fpDamageModel = pModel;
}
#endif