/*****************************************************************************
 * Authors:                                                                  *
 *   MC, Mathieu Chrétien, LPNHE Paris , chretien@lpnhe.in2p3.fr       *
 *****************************************************************************/
#ifndef ROOTH1VAR
#define ROOTH1VAR

#include "RooAbsReal.h"
#include "RooTH1Var.h"
#include "RooArgList.h"
#include "RooRealProxy.h"
#include "RooTrace.h"
#include "TH1.h"

class RooArgSet ;

class RooTH1Var : public RooAbsReal {
public:
  // Constructors, assignment etc
  RooTH1Var(const char *name, const char* title, TH1 *TH1Obj, RooAbsReal& x) ;
  RooTH1Var(const RooTH1Var& other, const char* name=0);
  virtual TObject* clone(const char* newname) const { return new RooTH1Var(*this,newname); }
  virtual ~RooTH1Var();

  

  // Function evaluation
  virtual Double_t evaluate() const ;

protected:
  
  TH1 *_hist ;            // TH1 object
  RooRealProxy _x ;     // Actual parameter used by TH1
  mutable RooArgSet* _nset ;     //! Normalization set to be passed along to contents
  ClassDef(RooTH1Var,1) // Real-valued function of other RooAbsArg calculated by a TH1 object
};

#endif