//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// G4VWeightWindowAlgorithm
//
// Class description:
// 
// Interface class for a weight window algorithm. It calculates
// the number of tracks and their weight according to the inital
// track weight and the lower energy bound in the energy-space
// cell.

// Author: Michael Dressel (CERN), 2003
// ----------------------------------------------------------------------
#ifndef G4VWEIGHTWINDOWALGORITHM_HH
#define G4VWEIGHTWINDOWALGORITHM_HH

#include "G4Nsplit_Weight.hh"

/**
 * @brief G4VWeightWindowAlgorithm is an interface class for a weight window
 * algorithm. It calculates the number of tracks and their weight according to
 * the inital track weight and the lower energy bound in the energy-space cell.
 */

class G4VWeightWindowAlgorithm
{
  public:

    /**
     * Default Constructor and Destructor.
     */
    G4VWeightWindowAlgorithm() = default;
    virtual ~G4VWeightWindowAlgorithm() = default;

    /**
     * Calculates the number of tracks and their weight according
     * to the initial track weight and the lower energy bound.
     */
    virtual G4Nsplit_Weight Calculate(G4double init_w,
                                      G4double lowerWeightBound) const = 0;
};

#endif