RooChangeTracker.h

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 *    File: $Id$
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
#ifndef ROO_CHANGE_TRACKER
#define ROO_CHANGE_TRACKER
 
#include "RooAbsReal.h"
#include "RooListProxy.h"
#include <vector>
 
class RooChangeTracker : public RooAbsReal {
public:
 
  RooChangeTracker() = default;
  RooChangeTracker(const char *name, const char *title, const RooArgSet& trackSet, bool checkValues=false) ;
 
  RooChangeTracker(const RooChangeTracker& other, const char* name = nullptr);
  TObject* clone(const char* newname=nullptr) const override { return new RooChangeTracker(*this, newname); }
 
  bool hasChanged(bool clearState) ;
 
  RooArgSet parameters() const ;
 
 
protected:
 
  RooListProxy     _realSet ;        ///< List of reals to track
  RooListProxy     _catSet ;         ///< List of categories to check
  std::vector<double> _realRef ;   ///< Reference values for reals
  std::vector<Int_t>    _catRef ;    ///< Reference values for categories
  bool       _checkVal = false;           ///< Check contents as well if true
 
  bool        _init = false; //!
 
  double evaluate() const override { return 1 ; }
 
  ClassDefOverride(RooChangeTracker,1) // Meta object that tracks changes in set of other arguments
};
 
#endif