Gabriele Cosmo
121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4ModifiedMidpoint
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//
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// Class description:
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//
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// Modified midpoint method implementation, based on Boost odeint.
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// Author: Dmitry Sorokin (CERN, Google Summer of Code 2016), 07.10.2016
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// Supervision: John Apostolakis (CERN)
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// --------------------------------------------------------------------
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#ifndef G4MODIFIED_MIDPOINT_HH
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#define G4MODIFIED_MIDPOINT_HH
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#include "G4Types.hh"
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#include "G4EquationOfMotion.hh"
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#include "G4FieldTrack.hh"
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/**
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* @brief G4ModifiedMidpoint implements a midpoint method adapted from
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* Boost odeint.
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*/
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class G4ModifiedMidpoint
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{
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public:
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/**
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* Constructor for G4ModifiedMidpoint.
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* @param[in] equation Pointer to the provided equation of motion.
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* @param[in] nvar The number of integration variables.
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* @param[in] steps The minimum number of steps.
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*/
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G4ModifiedMidpoint( G4EquationOfMotion* equation,
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G4int nvar = 6, G4int steps = 2 );
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/**
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* Default Destructor.
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*/
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~G4ModifiedMidpoint() = default;
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/**
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* Computes one step.
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* @param[in] yIn Starting values array of integration variables.
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* @param[in] dydxIn Derivatives array in input.
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* @param[out] yOut Integration output.
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* @param[in] hstep The given step size.
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*/
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void DoStep( const G4double yIn[], const G4double dydxIn[],
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G4double yOut[], G4double hstep) const;
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/**
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* Computes one step, as above but using also intermediate values.
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* @param[in] yIn Starting values array of integration variables.
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* @param[in] dydxIn Derivatives array in input.
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* @param[out] yOut Integration output.
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* @param[in] hstep The given step size.
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* @param[in] yMid Mid point integration variables.
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* @param[in] derivs Intermediate derivatives.
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*/
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void DoStep( const G4double yIn[], const G4double dydxIn[],
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G4double yOut[], G4double hstep, G4double yMid[],
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G4double derivs[][G4FieldTrack::ncompSVEC]) const;
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/**
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* Setter and getter for steps.
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*/
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inline void SetSteps(G4int steps);
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inline G4int GetSteps() const;
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/**
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* Setter and getter for the equation of motion.
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*/
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inline void SetEquationOfMotion(G4EquationOfMotion* equation);
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inline G4EquationOfMotion* GetEquationOfMotion() const;
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/**
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* Returns the number of integration variables.
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*/
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inline G4int GetNumberOfVariables() const;
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private:
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/**
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* Utility for copying array content from 'src' to 'dst'.
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*/
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void copy(G4double dst[], const G4double src[]) const;
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private:
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G4EquationOfMotion* fEquation = nullptr;
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G4int fnvar = 0;
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G4int fsteps = 0;
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};
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#include "G4ModifiedMidpoint.icc"
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#endif
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