parsed_function.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2007 - 2017 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 at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------


#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;

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

    virtual void set_time(const double newtime);

  private:
    FunctionParser<dim> function_object;
  };
}

DEAL_II_NAMESPACE_CLOSE

#endif