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 // -*- C++ -*-
 //
 // FFLightKinematics.h is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2019 The Herwig Collaboration
 //
 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef HERWIG_FFLightKinematics_H
 #define HERWIG_FFLightKinematics_H
 //
 // This is the declaration of the FFLightKinematics class.
 //
 
 #include "DipoleSplittingKinematics.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * \ingroup DipoleShower
  * \author Simon Platzer
  *
  * \brief FFLightKinematics implements massless splittings
  * off a final-final dipole.
  *
  */
 class FFLightKinematics: public DipoleSplittingKinematics {
 
 public:
 
   /**
    * The default constructor.
    */
   FFLightKinematics();
 
 public:
 
   /**
    * Return the maximum pt for the given dipole scale.
    */
   virtual Energy ptMax(Energy dScale, 
                double emX, double specX,
                const DipoleIndex& dIndex,
                const DipoleSplittingKernel&) const;
 
   /**
    * Return the maximum virtuality for the given dipole scale.
    */
   virtual Energy QMax(Energy dScale, 
               double emX, double specX,
               const DipoleIndex& dIndex,
               const DipoleSplittingKernel&) const;
 
   /**
    * Return the pt given a virtuality.
    */
   virtual Energy PtFromQ(Energy scale, const DipoleSplittingInfo&) const;
 
   /**
    * Return the virtuality given a pt.
    */
   virtual Energy QFromPt(Energy scale, const DipoleSplittingInfo&) const;
 
   /**
    * Return the boundaries on the momentum fraction
    */
   virtual pair<double,double> zBoundaries(Energy pt,
                       const DipoleSplittingInfo& dInfo,
                       const DipoleSplittingKernel& split) const;
 
   /**
    * Generate splitting variables given three random numbers
    * and the momentum fractions of the emitter and spectator.
    * Return true on success.
    */
   virtual bool generateSplitting(double kappa, double xi, double phi,
                  DipoleSplittingInfo& dIndex,
                  const DipoleSplittingKernel&);
 
   /**
    * Generate the full kinematics given emitter and
    * spectator momentum and a previously completeted
    * DipoleSplittingInfo object.
    */
   virtual void generateKinematics(const Lorentz5Momentum& pEmitter,
                   const Lorentz5Momentum& pSpectator,
                   const DipoleSplittingInfo& dInfo);
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * The standard Init function used to initialize the interfaces.
    * Called exactly once for each class by the class description system
    * before the main function starts or
    * when this class is dynamically loaded.
    */
   static void Init();
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const;
 
   /** Make a clone of this object, possibly modifying the cloned object
    * to make it sane.
    * @return a pointer to the new object.
    */
   virtual IBPtr fullclone() const;
   //@}
 
 
 // If needed, insert declarations of virtual function defined in the
 // InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
 
 
 private:
 
   /**
    * The static object used to initialize the description of this class.
    * Indicates that this is a concrete class with persistent data.
    */
   static ClassDescription<FFLightKinematics> initFFLightKinematics;
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   FFLightKinematics & operator=(const FFLightKinematics &) = delete;
 
 };
 
 }
 
 #include "ThePEG/Utilities/ClassTraits.h"
 
 namespace ThePEG {
 
 /** @cond TRAITSPECIALIZATIONS */
 
 /** This template specialization informs ThePEG about the
  *  base classes of FFLightKinematics. */
 template <>
 struct BaseClassTrait<Herwig::FFLightKinematics,1> {
   /** Typedef of the first base class of FFLightKinematics. */
   typedef Herwig::DipoleSplittingKinematics NthBase;
 };
 
 /** This template specialization informs ThePEG about the name of
  *  the FFLightKinematics class and the shared object where it is defined. */
 template <>
 struct ClassTraits<Herwig::FFLightKinematics>
   : public ClassTraitsBase<Herwig::FFLightKinematics> {
   /** Return a platform-independent class name */
   static string className() { return "Herwig::FFLightKinematics"; }
   /**
    * The name of a file containing the dynamic library where the class
    * FFLightKinematics is implemented. It may also include several, space-separated,
    * libraries if the class FFLightKinematics depends on other classes (base classes
    * excepted). In this case the listed libraries will be dynamically
    * linked in the order they are specified.
    */
   static string library() { return "HwDipoleShower.so"; }
 };
 
 /** @endcond */
 
 }
 
 #endif /* HERWIG_FFLightKinematics_H */

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