// DAEFunc.h                                             -*- C++ -*-
/*

Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton

This file is part of Octave.

Octave 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 2, or (at your option) any
later version.

Octave 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 Octave; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#if !defined (octave_DAEFunc_h)
#define octave_DAEFunc_h 1

#if defined (__GNUG__)
#pragma interface
#endif

class Matrix;
class ColumnVector;

#if !defined (octave_DAEFunc_typedefs)
#define octave_DAEFunc_typedefs 1

#endif

class DAEFunc
{
public:

  struct DAEJac
    {
      Matrix *dfdxdot;
      Matrix *dfdx;
    };

  typedef ColumnVector (*DAERHSFunc) (const ColumnVector& x,
				      const ColumnVector& xdot, double); 

  typedef DAEJac (*DAEJacFunc) (const ColumnVector& x,
				const ColumnVector& xdot, double);

  DAEFunc (void)
    {
      fun = 0;
      jac = 0;
    }

  DAEFunc (DAERHSFunc f)
    {
      fun = f;
      jac = 0;
    }

  DAEFunc (DAERHSFunc f, DAEJacFunc j)
    {
      fun = f;
      jac = j;
    }

  DAEFunc (const DAEFunc& a)
    {
      fun = a.fun;
      jac = a.jac;
    }

  DAEFunc& operator = (const DAEFunc& a)
    {
      fun = a.fun;
      jac = a.jac;

      return *this;
    }

  DAERHSFunc function (void) const { return fun; }

  DAEFunc& set_function (DAERHSFunc f)
    {
      fun = f;
      return *this;
    }

  DAEJacFunc jacobian_function (void) const { return jac; }

  DAEFunc& set_jacobian_function (DAEJacFunc j)
    {
      jac = j;
      return *this;
    }

protected:

  DAERHSFunc fun;
  DAEJacFunc jac;
};

#endif

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