// Created on: 1991-05-14
// Created by: Laurent PAINNOT
// Copyright (c) 1991-1999 Matra Datavision
// Copyright (c) 1999-2014 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_GaussSingleIntegration_HeaderFile
#define _math_GaussSingleIntegration_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <Standard_Real.hxx>
#include <Standard_Boolean.hxx>
#include <Standard_Integer.hxx>
#include <Standard_OStream.hxx>
class StdFail_NotDone;
class math_Function;



//! This class implements the integration of a function of a single variable
//! between the parameter bounds Lower and Upper.
//! Warning: Order must be inferior or equal to 61.
class math_GaussSingleIntegration 
{
public:

  DEFINE_STANDARD_ALLOC

  
  Standard_EXPORT math_GaussSingleIntegration();
  

  //! The Gauss-Legendre integration with N = Order points of integration,
  //! is done on the function F between the bounds Lower and Upper.
  Standard_EXPORT math_GaussSingleIntegration(math_Function& F, const Standard_Real Lower, const Standard_Real Upper, const Standard_Integer Order);
  

  //! The Gauss-Legendre integration with N = Order points of integration  and
  //! given tolerance = Tol is done on the function F between the bounds
  //! Lower and Upper.
  Standard_EXPORT math_GaussSingleIntegration(math_Function& F, const Standard_Real Lower, const Standard_Real Upper, const Standard_Integer Order, const Standard_Real Tol);
  
  //! returns True if all has been correctly done.
    Standard_Boolean IsDone() const;
  
  //! returns the value of the integral.
    Standard_Real Value() const;
  
  //! Prints information on the current state of the object.
  Standard_EXPORT void Dump (Standard_OStream& o) const;




protected:





private:

  
  //! performs  actual  computation
  Standard_EXPORT void Perform (math_Function& F, const Standard_Real Lower, const Standard_Real Upper, const Standard_Integer Order);


  Standard_Real Val;
  Standard_Boolean Done;


};


#include <math_GaussSingleIntegration.lxx>





#endif // _math_GaussSingleIntegration_HeaderFile
