DAEFunc.h

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//
// Copyright (C) 1993-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
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////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_DAEFunc_h)
#define octave_DAEFunc_h 1
 
#include "octave-config.h"
 
class Matrix;
class ColumnVector;
 
class
DAEFunc
{
public:
 
  typedef ColumnVector (*DAERHSFunc) (const ColumnVector& x,
                                      const ColumnVector& xdot,
                                      double t, octave_idx_type& ires);
 
  // This is really the form used by DASSL:
  //
  //   PD = DG/DY + CJ * DG/DYPRIME
 
  typedef Matrix (*DAEJacFunc) (const ColumnVector& x,
                                const ColumnVector& xdot,
                                double t, double cj);
 
  DAEFunc (void)
    : fun (nullptr), jac (nullptr), reset (true) { }
 
  DAEFunc (DAERHSFunc f)
    : fun (f), jac (nullptr), reset (true) { }
 
  DAEFunc (DAERHSFunc f, DAEJacFunc j)
    : fun (f), jac (j), reset (true) { }
 
  DAEFunc (const DAEFunc& a)
    : fun (a.fun), jac (a.jac), reset (a.reset) { }
 
  DAEFunc& operator = (const DAEFunc& a)
  {
    if (this != &a)
      {
        fun = a.fun;
        jac = a.jac;
        reset = a.reset;
      }
    return *this;
  }
 
  virtual ~DAEFunc (void) = default;
 
  DAERHSFunc function (void) const { return fun; }
 
  DAEFunc& set_function (DAERHSFunc f)
  {
    fun = f;
    reset = true;
    return *this;
  }
 
  DAEJacFunc jacobian_function (void) const { return jac; }
 
  DAEFunc& set_jacobian_function (DAEJacFunc j)
  {
    jac = j;
    reset = true;
    return *this;
  }
 
protected:
 
  DAERHSFunc fun;
  DAEJacFunc jac;
 
  // This variable is TRUE when this object is constructed, and also
  // after any internal data has changed.  Derived classes may use
  // this information (and change it) to know when to (re)initialize
  // their own internal data related to this object.
 
  bool reset;
};
 
#endif