RooAdaptiveGaussKronrodIntegrator1D.h

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 *    File: $Id: RooAdaptiveGaussKronrodIntegrator1D.h,v 1.5 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_ADAPTIVE_GAUSS_KRONROD_INTEGRATOR_1D
#define ROO_ADAPTIVE_GAUSS_KRONROD_INTEGRATOR_1D
 
#include "RooAbsIntegrator.h"
#include "RooNumIntConfig.h"
 
double RooAdaptiveGaussKronrodIntegrator1D_GSL_GlueFunction(double x, void *data);
 
class RooAdaptiveGaussKronrodIntegrator1D : public RooAbsIntegrator {
public:
   // Constructors, assignment etc
   RooAdaptiveGaussKronrodIntegrator1D(const RooAbsFunc &function, const RooNumIntConfig &config);
   RooAdaptiveGaussKronrodIntegrator1D(const RooAbsFunc &function, double xmin, double xmax,
                                       const RooNumIntConfig &config);
   ~RooAdaptiveGaussKronrodIntegrator1D() override;
 
   bool checkLimits() const override;
   double integral(const double *yvec = nullptr) override;
 
   using RooAbsIntegrator::setLimits;
   bool setLimits(double *xmin, double *xmax) override;
   bool setUseIntegrandLimits(bool flag) override
   {
      // If flag is true, integration limits are taken from definition in input function binding
      _useIntegrandLimits = flag;
      return true;
   }
 
protected:
   friend class RooNumIntFactory;
   static void registerIntegrator(RooNumIntFactory &fact);
 
   enum DomainType { Closed, OpenLo, OpenHi, Open };
   mutable DomainType _domainType;
 
   friend double RooAdaptiveGaussKronrodIntegrator1D_GSL_GlueFunction(double x, void *data);
 
   bool initialize();
 
   bool _useIntegrandLimits;
 
   double *xvec(double &xx)
   {
      // Return contents of xx in internal array pointer
      _x[0] = xx;
      return _x.data();
   }
   std::vector<double> _x; ///<! Current coordinate
 
   double _epsAbs;             // Absolute precision
   double _epsRel;             // Relative precision
   Int_t _methodKey;           // GSL method key
   Int_t _maxSeg;              // Maximum number of segments
   void *_workspace = nullptr; // GSL workspace
 
   mutable double _xmin; ///<! Lower integration bound
   mutable double _xmax; ///<! Upper integration bound
};
 
#endif