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// 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
