parsed_function.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2007 - 2018 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------


#ifndef dealii_parsed_function_h
#define dealii_parsed_function_h

#include <deal.II/base/auto_derivative_function.h>
#include <deal.II/base/function_parser.h>
#include <deal.II/base/parameter_handler.h>

DEAL_II_NAMESPACE_OPEN

namespace Functions
{
  template <int dim>
  class ParsedFunction : public AutoDerivativeFunction<dim>
  {
  public:
    ParsedFunction(const unsigned int n_components = 1, const double h = 1e-8);

    static void
    declare_parameters(ParameterHandler & prm,
                       const unsigned int n_components = 1);

    void
    parse_parameters(ParameterHandler &prm);

    virtual void
    vector_value(const Point<dim> &p, Vector<double> &values) const override;

    virtual double
    value(const Point<dim> &p, const unsigned int component = 0) const override;

    virtual void
    set_time(const double newtime) override;

  private:
    FunctionParser<dim> function_object;
  };
} // namespace Functions

DEAL_II_NAMESPACE_CLOSE

#endif