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 // -*- C++ -*-
 //
 // DipoleEvolutionOrdering.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_DipoleEvolutionOrdering_H
 #define HERWIG_DipoleEvolutionOrdering_H
 //
 // This is the declaration of the DipoleEvolutionOrdering class.
 //
 
 #include "ThePEG/Handlers/HandlerBase.h"
 
 #include "Herwig/Shower/Dipole/Base/Dipole.h"
 #include "Herwig/Shower/Dipole/Base/DipoleChain.h"
 #include "Herwig/Shower/Dipole/Kernels/DipoleSplittingKernel.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * \ingroup DipoleShower
  * \author Simon Platzer
  *
  * \brief DipoleEvolutionOrdering defines a particular evolution
  * algortihm for the dipole shower.
  *
  */
 class DipoleEvolutionOrdering: public HandlerBase {
 
 public:
 
   /** @name Standard constructors and destructors. */
   //@{
   /**
    * The default constructor.
    */
   DipoleEvolutionOrdering();
 
   /**
    * The destructor.
    */
   virtual ~DipoleEvolutionOrdering();
   //@}
 
 public:
 
   /**
    * Return true, if this ordering requests
    * an independent dipole evolution.
    */
   virtual bool independentDipoles() const { return false; }
 
   /**
    * For the given dipole and splitting kernel return
    * the hard scale.
    */
   virtual Energy hardScale(tPPtr emitter, tPPtr spectator,
                double emitterX, double spectatorX,
                const DipoleSplittingKernel&,
                const DipoleIndex&) const = 0;
 
   /**
    * For the given performed splitting, dipole chain
    * and dipoles originating from the splitting, set the next
    * scale.
    */
   virtual void setEvolutionScale(Energy scale,
                  const DipoleSplittingInfo&,
                  DipoleChain&,
                  pair<list<Dipole>::iterator,list<Dipole>::iterator>) const = 0;
 
   /**
    * For the given performed splitting, dipole chain
    * and dipole taking a recoil, set the next
    * scale.
    */
   virtual void setEvolutionScale(Energy scale,
                  const DipoleSplittingInfo&,
                  DipoleChain&,
                  list<Dipole>::iterator) const = 0;
 
   /**
    * For the given selected splitting return the evolution scale.
    */
   virtual Energy evolutionScale(const DipoleSplittingInfo&,
                 const DipoleSplittingKernel&) const = 0;
 
   /**
    * Return the maximum pt corresponding to the given
    * evolution scale.
    */
   virtual Energy maxPt(Energy scale,
                const DipoleSplittingInfo&,
                const DipoleSplittingKernel&) const = 0;
 
 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();
 
 // 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 an abstract class with persistent data.
    */
   static AbstractClassDescription<DipoleEvolutionOrdering> initDipoleEvolutionOrdering;
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   DipoleEvolutionOrdering & operator=(const DipoleEvolutionOrdering &) = delete;
 
 };
 
 }
 
 #include "ThePEG/Utilities/ClassTraits.h"
 
 namespace ThePEG {
 
 /** @cond TRAITSPECIALIZATIONS */
 
 /** This template specialization informs ThePEG about the
  *  base classes of DipoleEvolutionOrdering. */
 template <>
 struct BaseClassTrait<Herwig::DipoleEvolutionOrdering,1> {
   /** Typedef of the first base class of DipoleEvolutionOrdering. */
   typedef HandlerBase NthBase;
 };
 
 /** This template specialization informs ThePEG about the name of
  *  the DipoleEvolutionOrdering class and the shared object where it is defined. */
 template <>
 struct ClassTraits<Herwig::DipoleEvolutionOrdering>
   : public ClassTraitsBase<Herwig::DipoleEvolutionOrdering> {
   /** Return a platform-independent class name */
   static string className() { return "Herwig::DipoleEvolutionOrdering"; }
   /**
    * The name of a file containing the dynamic library where the class
    * DipoleEvolutionOrdering is implemented. It may also include several, space-separated,
    * libraries if the class DipoleEvolutionOrdering 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_DipoleEvolutionOrdering_H */

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