#ifndef ALIHBTLLWEIGHTTHEORFCTN_H
#define ALIHBTLLWEIGHTTHEORFCTN_H
/* $Id$ */

//Author: Ludmila Malinina, JINR (malinina@sunhe.jinr.ru)

#include "AliHBTFunction.h"


class AliHBTLLWeights;

class AliHBTLLWeightTheorQInvFctn: public AliHBTOnePairFctn1D
{
  //This function allows to obtain Q_inv correlation function with weights
  //calculated by Lednicky's alghorithm.
  //Numerator is filled with weighted events. Weights are attributed to simulated particles.
  //Weights are calculated with corresponding simulated particles momenta.
  //Denominator is filled with mixing unweighted simulated particles.
  //One needs only simulated pairs, so 
  //this function is of class AliHBTOnePairFctn1D.
  //Author Ludmila Malinina JINR (malinina@sunhe.jinr.ru)

  public:
  AliHBTLLWeightTheorQInvFctn(Int_t nbins = 100, Double_t maxXval = 0.15, Double_t minXval = 0.0);
  
  virtual  ~AliHBTLLWeightTheorQInvFctn(){};
  TH1* GetResult(); 

  void   ProcessSameEventParticles(AliHBTPair* partpair);
      
  Double_t GetValue(AliHBTPair* partpair) const
    { return partpair->GetQInv();} //isn't used

  ClassDef(AliHBTLLWeightTheorQInvFctn,1)
};
  
#endif