//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id: G4GaussLaguerreQ.hh,v 1.6 2006/06/29 18:59:40 gunter Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// Class description:
//
// Class for realization of Gauss-Laguerre quadrature method
// Roots of ortogonal polynoms and corresponding weights are calculated based on
// iteration method (by bisection Newton algorithm). Constant values for initial
// approximations were derived from the book: M. Abramowitz, I. Stegun, Handbook
// of mathematical functions, DOVER Publications INC, New York 1965 ; chapters 9,
// 10, and 22 .
//
// ---------------------------------------------------------------------------
//
// Constructor for Gauss-Laguerre quadrature method: integral from zero to
// infinity of std::pow(x,alpha)*std::exp(-x)*f(x). The value of nLaguerre sets the accuracy.
// The constructor creates arrays fAbscissa[0,..,nLaguerre-1] and 
// fWeight[0,..,nLaguerre-1] . The function GaussLaguerre(f) should be called
// then with any f .
//
// G4GaussLaguerreQ( function pFunction,
//                   G4double alpha,
// 		     G4int nLaguerre  ) 
//
//
// -------------------------------------------------------------------------
//
// Gauss-Laguerre method for integration of std::pow(x,alpha)*std::exp(-x)*pFunction(x)
// from zero up to infinity. pFunction is evaluated in fNumber points for which
// fAbscissa[i] and fWeight[i] arrays were created in constructor
//
// G4double  Integral() const 

// ------------------------------- HISTORY --------------------------------
//
// 13.05.97 V.Grichine (Vladimir.Grichine@cern.chz0

#ifndef G4GAUSSLAGUERREQ_HH
#define G4GAUSSLAGUERREQ_HH

#include "G4VGaussianQuadrature.hh"

class G4GaussLaguerreQ : public G4VGaussianQuadrature
{
public:
        G4GaussLaguerreQ( function pFunction,
	                  G4double alpha,
			  G4int nLaguerre           ) ;
			       
        // Methods
			     
        G4double Integral() const ;

private:

	G4GaussLaguerreQ(const G4GaussLaguerreQ&);
	G4GaussLaguerreQ& operator=(const G4GaussLaguerreQ&);
};

#endif
