EvtItgAbsIntegrator.hh

Go to the documentation of this file.

//--------------------------------------------------------------------------
//
//
// Copyright Information: See EvtGen/COPYRIGHT
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Module: EvtItgAbsIntegrator.hh
//
// Description:
//      Abstraction of a generic integrator (Stolen and modified from
//      the BaBar IntegrationUtils package - author: Phil Strother).
//
// Modification history:
//
//    Jane Tinslay                March 21, 2001       Module adapted for use in
//                                                     EvtGen
//
//------------------------------------------------------------------------
 
#ifndef EVTITGABSINTEGRATOR_HH
#define EVTITGABSINTEGRATOR_HH
 
#include "EvtItgAbsFunction.hh"
 
class EvtItgAbsIntegrator {
 
public:
  EvtItgAbsIntegrator( const EvtItgAbsFunction& );
 
  virtual ~EvtItgAbsIntegrator();
 
  double evaluate( double lower, double upper ) const;
 
  double normalisation() const;
 
protected:
  double trapezoid( double lower, double higher, int n, double& result ) const;
 
  virtual double evaluateIt( double lower, double higher ) const = 0;
 
  double myFunction( double x ) const { return _myFunction( x ); }
 
private:
  const EvtItgAbsFunction& _myFunction;
 
  void boundsCheck( double&, double& ) const;
 
  // Note: if your class needs a copy constructor or an assignment operator,
  //  make one of the following public and implement it.
  EvtItgAbsIntegrator();
  EvtItgAbsIntegrator( const EvtItgAbsIntegrator& );            // Copy Constructor
  EvtItgAbsIntegrator& operator=( const EvtItgAbsIntegrator& ); // Assignment op
};
 
#endif // EVTITGABSINTEGRATOR_HH