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 // Created on: 2005-12-08
 // Created by: Sergey KHROMOV
 // Copyright (c) 2005-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _math_KronrodSingleIntegration_HeaderFile
 #define _math_KronrodSingleIntegration_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_Integer.hxx>
 #include <math_Vector.hxx>
 class math_Function;
 
 //! This class implements the Gauss-Kronrod method of
 //! integral computation.
 class math_KronrodSingleIntegration
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! An empty constructor.
   Standard_EXPORT math_KronrodSingleIntegration();
 
   //! Constructor. Takes the function, the lower and upper bound
   //! values, the initial number of Kronrod points
   Standard_EXPORT math_KronrodSingleIntegration(math_Function& theFunction,
                                                 const double   theLower,
                                                 const double   theUpper,
                                                 const int      theNbPnts);
 
   //! Constructor. Takes the function, the lower and upper bound
   //! values, the initial number of Kronrod points, the
   //! tolerance value and the maximal number of iterations as
   //! parameters.
   Standard_EXPORT math_KronrodSingleIntegration(math_Function& theFunction,
                                                 const double   theLower,
                                                 const double   theUpper,
                                                 const int      theNbPnts,
                                                 const double   theTolerance,
                                                 const int      theMaxNbIter);
 
   //! Computation of the integral. Takes the function,
   //! the lower and upper bound values, the initial number
   //! of Kronrod points, the relative tolerance value and the
   //! maximal number of iterations as parameters.
   //! theNbPnts should be odd and greater then or equal to 3.
   Standard_EXPORT void Perform(math_Function& theFunction,
                                const double   theLower,
                                const double   theUpper,
                                const int      theNbPnts);
 
   //! Computation of the integral. Takes the function,
   //! the lower and upper bound values, the initial number
   //! of Kronrod points, the relative tolerance value and the
   //! maximal number of iterations as parameters.
   //! theNbPnts should be odd and greater then or equal to 3.
   //! Note that theTolerance is relative, i.e. the criterion of
   //! solution reaching is:
   //! std::abs(Kronrod - Gauss)/std::abs(Kronrod) < theTolerance.
   //! theTolerance should be positive.
   Standard_EXPORT void Perform(math_Function& theFunction,
                                const double   theLower,
                                const double   theUpper,
                                const int      theNbPnts,
                                const double   theTolerance,
                                const int      theMaxNbIter);
 
   //! Returns true if computation is performed
   //! successfully.
   bool IsDone() const;
 
   //! Returns the value of the integral.
   double Value() const;
 
   //! Returns the value of the relative error reached.
   double ErrorReached() const;
 
   //! Returns the value of the relative error reached.
   double AbsolutError() const;
 
   //! Returns the number of Kronrod points
   //! for which the result is computed.
   int OrderReached() const;
 
   //! Returns the number of iterations
   //! that were made to compute result.
   int NbIterReached() const;
 
   Standard_EXPORT static bool GKRule(math_Function&     theFunction,
                                      const double       theLower,
                                      const double       theUpper,
                                      const math_Vector& theGaussP,
                                      const math_Vector& theGaussW,
                                      const math_Vector& theKronrodP,
                                      const math_Vector& theKronrodW,
                                      double&            theValue,
                                      double&            theError);
 
 private:
   bool   myIsDone;
   double myValue;
   double myErrorReached;
   double myAbsolutError;
   int    myNbPntsReached;
   int    myNbIterReached;
 };
 
 #include <math_KronrodSingleIntegration.lxx>
 
 #endif // _math_KronrodSingleIntegration_HeaderFile

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