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EvtItgAbsIntegrator.hh
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EvtItgAbsIntegrator.hh
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//--------------------------------------------------------------------------
//
//
// 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 "EvtGenModels/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

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