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 // -*- C++ -*-
 //
 // TwoBodyDecayConstructor.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_TwoBodyDecayConstructor_H
 #define HERWIG_TwoBodyDecayConstructor_H
 //
 // This is the declaration of the TwoBodyDecayConstructor class.
 //
 
 #include "NBodyDecayConstructorBase.h"
 #include "ThePEG/Helicity/Vertex/VertexBase.h"
 #include "Herwig/Decay/General/GeneralTwoBodyDecayer.fh"
 #include "Herwig/Shower/ShowerAlpha.h"
 #include "TwoBodyDecay.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
 using Helicity::VertexBasePtr;
 using Helicity::tVertexBasePtr;
 
 /**
  * The TwoBodyDecayConstructor class inherits from the dummy base class
  * NBodyDecayConstructorBase and implements the necessary functions in
  * order to create the 2 body decay modes for a given set of vertices
  * stored in a Model class.
  *
  * @see \ref TwoBodyDecayConstructorInterfaces "The interfaces"
  * defined for TwoBodyDecayConstructor.
  * @see NBodyDecayConstructor
  **/
 class TwoBodyDecayConstructor: public NBodyDecayConstructorBase {
 
 public:
 
   /**
    * The default constructor.
    */
   TwoBodyDecayConstructor() : inter_(ShowerInteraction::QEDQCD), weakMassCut_(-GeV) {
     radiationVertices_[ShowerInteraction::QCD] = map<tPDPtr,VertexBasePtr>();
     radiationVertices_[ShowerInteraction::QED] = map<tPDPtr,VertexBasePtr>();
   }
 
   /**
    * Function used to determine allowed decaymodes
    *@param part vector of ParticleData pointers containing particles in model
    */
   virtual void DecayList(const set<PDPtr,MassOrdering> & particles);
 
   /**
    * Number of outgoing lines. Required for correct ordering.
    */
   virtual unsigned int numBodies() const { return 2; }
 
 
 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;
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   TwoBodyDecayConstructor & operator=(const TwoBodyDecayConstructor &) = delete;
 
 private:
 
   /** @name Functions to create decayers and decaymodes. */
   //@{
   /**
    * Function to create decays
    * @param inpart Incoming particle
    * @param vert The vertex to create decays for
    * @param ilist Which list to search
    * @param iv Row number in _theExistingDecayers member
    * @return A vector a decay modes
    */
   void createModes(tPDPtr inpart, VertexBasePtr vert,
            unsigned int ilist,
            multiset<TwoBodyDecay> & modes);
 
   /**
    * Function to create decayer for specific vertex
    * @param decay decay mode for this decay
    * member variable
    */
   GeneralTwoBodyDecayerPtr createDecayer(TwoBodyDecay decay,
                      vector<VertexBasePtr> );
 
   /**
    * Create decay mode(s) from given part and decay modes
    * @param decays The vector of decay modes
    * @param decayer The decayer responsible for this decay
    */
   void createDecayMode(multiset<TwoBodyDecay> & decays);
   //@}
 
   /**
    * Get the vertex for QED/QCD radiation
    */
   VertexBasePtr radiationVertex(tPDPtr particle,ShowerInteraction inter,
                 tPDPair children = tPDPair ());
 
 private:
 
   /**
    *  Map of particles and the vertices which generate their QCD
    *  radiation
    */
   map<ShowerInteraction,map<tPDPtr,VertexBasePtr> > radiationVertices_;
 
   /**
    *  Default choice for the strong coupling object for hard QCD radiation
    */
   ShowerAlphaPtr  alphaQCD_;
 
   /**
    *  Default choice for the strong coupling object for hard QED radiation
    */
   ShowerAlphaPtr  alphaQED_;
 
   /**
    *  Which type of corrections to the decays to include
    */
   ShowerInteraction inter_;
 
   /**
    *  Cut off or decays via the weak current
    */
   Energy weakMassCut_;
 
 };
 
 }
 
 #endif /* HERWIG_TwoBodyDecayConstructor_H */

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