RooImproperIntegrator1D.h

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 *    File: $Id: RooImproperIntegrator1D.h,v 1.12 2007/05/11 09:11:30 verkerke Exp $
 * 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_IMPROPER_INTEGRATOR_1D
#define ROO_IMPROPER_INTEGRATOR_1D
 
#include "RooAbsIntegrator.h"
#include "RooNumIntConfig.h"
 
class RooInvTransform;
class RooRombergIntegrator;
 
class RooImproperIntegrator1D : public RooAbsIntegrator {
public:
   RooImproperIntegrator1D(const RooAbsFunc &function);
   RooImproperIntegrator1D(const RooAbsFunc &function, const RooNumIntConfig &config);
   RooImproperIntegrator1D(const RooAbsFunc &function, double xmin, double xmax, const RooNumIntConfig &config);
 
   bool checkLimits() const override;
   using RooAbsIntegrator::setLimits;
   bool setLimits(double *xmin, double *xmax) override;
   bool setUseIntegrandLimits(bool flag) override
   {
      _useIntegrandLimits = flag;
      return true;
   }
   double integral(const double *yvec = nullptr) override;
 
protected:
   friend class RooNumIntFactory;
   static void registerIntegrator(RooNumIntFactory &fact);
 
   void initialize(const RooAbsFunc *function = nullptr);
 
   enum LimitsCase {
      Invalid,
      ClosedBothEnds,
      OpenBothEnds,
      OpenBelowSpansZero,
      OpenBelow,
      OpenAboveSpansZero,
      OpenAbove
   };
   LimitsCase limitsCase() const;
   LimitsCase _case;            ///< Configuration of limits
   mutable double _xmin, _xmax; ///< Value of limits
   bool _useIntegrandLimits;    ///< Use limits in function binding?
 
   RooAbsFunc *_origFunc = nullptr;                       ///< Original function binding
   std::unique_ptr<RooInvTransform> _function;            ///< Binding with inverse of function
   RooNumIntConfig _config;                               ///< Configuration object
   mutable std::unique_ptr<RooRombergIntegrator> _integrator1; ///< Piece integrator 1
   mutable std::unique_ptr<RooRombergIntegrator> _integrator2; ///< Piece integrator 2
   mutable std::unique_ptr<RooRombergIntegrator> _integrator3; ///< Piece integrator 3
};
 
#endif