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 // -*- C++ -*-
 //
 // VBFNLOPhasespace.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_VBFNLOPhasespace_H
 #define Herwig_VBFNLOPhasespace_H
 //
 // This is the declaration of the VBFNLOPhasespace class.
 //
 
 #include "Herwig/MatrixElement/Matchbox/Phasespace/MatchboxPhasespace.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * \ingroup Matchbox
  * \author Michael Rauch
  *
  * \brief VBFNLOPhasespace is an interface to the internal phasespace generator
  * of VBFNLO. It uses the information passed via the BLHA interface to obtain
  * information on the required channels.
  *
  * @see \ref VBFNLOPhasespaceInterfaces "The interfaces"
  * defined for VBFNLOPhasespace.
  */
 class VBFNLOPhasespace: public MatchboxPhasespace {
 
 public:
 
   /** @name Standard constructors and destructors. */
   //@{
   /**
    * The default constructor.
    */
   VBFNLOPhasespace();
 
   /**
    * The destructor.
    */
   virtual ~VBFNLOPhasespace();
   //@}
 
 public:
 
   /**
    * Prepare a phase space generator for the given xcomb object.
    */
   virtual void setXComb(tStdXCombPtr);
 
   /**
    * Generate a phase space point and return its weight.
    */
   virtual double generateTwoToNKinematics(const double*,
                       vector<Lorentz5Momentum>& momenta);
 
   /**
    * Generate a phase space point and return its weight.
    */
   virtual double generateKinematics(const double* random,
                     vector<Lorentz5Momentum>& momenta) {
     return generateTwoToNKinematics(random,momenta);
   }
 
   /**
    * Return the number of random numbers required to produce a given
    * multiplicity final state.
    */
   virtual int nDimPhasespace(int nFinal) const;
 
   /**
    * Return true, if this phasespace generator will generate incoming
    * partons itself.
    */
   virtual bool haveX1X2() const { return true; }
 
   /**
    * Return true, if this phase space generator expects
    * the incoming partons in their center-of-mass system
    */
   virtual bool wantCMS() const { return false; }
 
   /**
    * Return true, if this phase space generator is invertible
    */
   virtual bool isInvertible() const { return false; }
 
 
 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).
 
 
 protected:
 
   /** @name Standard Interfaced functions. */
   //@{
   /**
    * Initialize this object after the setup phase before saving an
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object. Called in the run phase just before
    * a run begins.
    */
   virtual void doinitrun();
   //@}
 
 
 private:
 
   /**
    * Last hadronic centre-of-mass energy, to update VBFNLO value only
    * when this has changed.
    */
   Energy lastSqrtS;
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   VBFNLOPhasespace & operator=(const VBFNLOPhasespace &) = delete;
 
   /**
    * Whether or not we need to reshuffle.
    */
   bool needToReshuffle;
 
 protected:
 
   /**
    * Location of the VBFNLO library
    */
   string VBFNLOlib_;
 
   /**
    *  load the VBFNLO library
    */
   void loadVBFNLO();
 
   /**
    * The function object defining the equation
    * to be solved.
    */
   struct ReshuffleEquation {
 
     typedef double ArgType;
     typedef Energy ValType;
 
     static double aUnit() { return 1.; }
     static Energy vUnit() { return 1.*GeV; }
 
     Energy operator() (double xi) const;
 
     Energy w;
     cPDVector::const_iterator dataBegin;
     cPDVector::const_iterator dataEnd;
     vector<Lorentz5Momentum>::const_iterator momentaBegin;
     vector<Lorentz5Momentum>::const_iterator momentaEnd;
 
     ReshuffleEquation(Energy q,
               cPDVector::const_iterator dBegin,
               cPDVector::const_iterator dEnd,
               vector<Lorentz5Momentum>::const_iterator mBegin,
               vector<Lorentz5Momentum>::const_iterator mEnd)
       : w(q),
     dataBegin(dBegin), dataEnd(dEnd),
     momentaBegin(mBegin),
     momentaEnd(mEnd) {}
 
   };
 
 };
 
 }
 
 #endif /* Herwig_VBFNLOPhasespace_H */

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