EvtItgAbsFunction.hh
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EvtItgAbsFunction.hh
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	/***********************************************************************
	* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
	* *
	* This file is part of EvtGen. *
	* *
	* EvtGen is free software: you can redistribute it and/or modify *
	* it under the terms of the GNU General Public License as published by *
	* the Free Software Foundation, either version 3 of the License, or *
	* (at your option) any later version. *
	* *
	* EvtGen is distributed in the hope that it will be useful, *
	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	* GNU General Public License for more details. *
	* *
	* You should have received a copy of the GNU General Public License *
	* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
	***********************************************************************/

	#ifndef EVTITGABSFUNCTION_HH
	#define EVTITGABSFUNCTION_HH

	//-------------
	// C Headers --
	//-------------
	extern "C" {
	}

	// Description:
	// Abstraction of a generic function for use in integration methods elsewhere
	// in this package. (Stolen and modified from the BaBar IntegrationUtils package
	// - author: Phil Strother).

	class EvtItgAbsFunction {
	public:
	// Constructors

	EvtItgAbsFunction( double lowerRange, double upperRange );

	// Destructor
	virtual ~EvtItgAbsFunction() = default;

	virtual double value( double x ) const;

	virtual double operator()( double x ) const;

	// Selectors (const)

	inline double upperRange() const { return _upperRange; }
	inline double lowerRange() const { return _lowerRange; }
	inline void getRange( double& lower, double& upper ) const
	{
	lower = _lowerRange;
	upper = _upperRange;
	}
	virtual void setCoeff( int, int, double ) = 0;
	virtual double getCoeff( int, int ) = 0;

	protected:
	virtual double myFunction( double x ) const = 0;
	void setRange( double x1, double x2 )
	{
	_lowerRange = x1;
	_upperRange = x2;
	};

	private:
	double _upperRange;
	double _lowerRange;
	};

	#endif // EVTITGABSFUNCTION_HH

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