[u/mrichter/AliRoot.git] / TEvtGen / EvtGenModels / EvtItgAbsIntegrator.hh

//--------------------------------------------------------------------------
//
//
// 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
Commit	Line	Data
da0e9ce3	1	//--------------------------------------------------------------------------
	2	//
	3	//
	4	// Copyright Information: See EvtGen/COPYRIGHT
	5	//
	6	// Environment:
	7	// This software is part of the EvtGen package developed jointly
	8	// for the BaBar and CLEO collaborations. If you use all or part
	9	// of it, please give an appropriate acknowledgement.
	10	//
	11	// Module: EvtItgAbsIntegrator.hh
	12	//
	13	// Description:
	14	// Abstraction of a generic integrator (Stolen and modified from
	15	// the BaBar IntegrationUtils package - author: Phil Strother).
	16	//
	17	// Modification history:
	18	//
	19	// Jane Tinslay March 21, 2001 Module adapted for use in
	20	// EvtGen
	21	//
	22	//------------------------------------------------------------------------
	23
	24	#ifndef EVTITGABSINTEGRATOR_HH
	25	#define EVTITGABSINTEGRATOR_HH
	26
	27
	28	#include "EvtGenModels/EvtItgAbsFunction.hh"
	29
	30	class EvtItgAbsIntegrator {
	31
	32	public:
	33
	34	EvtItgAbsIntegrator(const EvtItgAbsFunction &);
	35
	36	virtual ~EvtItgAbsIntegrator( );
	37
	38	double evaluate(double lower, double upper) const;
	39
	40	double normalisation() const;
	41
	42	protected:
	43
	44	double trapezoid(double lower, double higher, int n,
	45	double &result) const;
	46
	47	virtual double evaluateIt(double lower, double higher) const=0;
	48
	49	double myFunction(double x) const {return _myFunction(x);}
	50
	51	private:
	52
	53	const EvtItgAbsFunction &_myFunction;
	54
	55	void boundsCheck(double &, double &) const;
	56
	57	// Note: if your class needs a copy constructor or an assignment operator,
	58	// make one of the following public and implement it.
	59	EvtItgAbsIntegrator();
	60	EvtItgAbsIntegrator( const EvtItgAbsIntegrator& ); // Copy Constructor
	61	EvtItgAbsIntegrator& operator= ( const EvtItgAbsIntegrator& ); // Assignment op
	62
	63	};
	64
65	#endif // EVTITGABSINTEGRATOR_HH