df.h

#ifndef theplu_yat_utility_univariable_df
#define theplu_yat_utility_univariable_df

// $Id: df.h 4239 2022-09-18 03:17:13Z peter $

/*
  Copyright (C) 2022 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library 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 3 of the
  License, or (at your option) any later version.

  The yat library 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 yat. If not, see <https://www.gnu.org/licenses/>.
*/

namespace theplu {
namespace yat {
namespace utility {

  namespace univariable
  {
    template<class FUNC>
    double df(double x, void* params)
    {
      FUNC* func = static_cast<FUNC*>(params);
      return func->derivative(x);
    }

    template<class FUNC>
    void fdf(double x, void* params, double* f, double* df)
    {
      FUNC* func = static_cast<FUNC*>(params);
      *f = (*func)(x);
      *df = func->derivative(x);
    }
  } // end namespace univariable

}}} // end namespaces utility, yat and theplu
#endif