function.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2022 by Luca Heltai
//
// This file is part of the FSI-suite platform, based on the deal.II library.
//
// The FSI-suite platform 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 3.0 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 FSI-suite platform
// distribution.
//
// ---------------------------------------------------------------------
 
#ifndef parsed_tools_function_h
#define parsed_tools_function_h
 
#include <deal.II/base/function_parser.h>
#include <deal.II/base/parameter_acceptor.h>
 
namespace ParsedTools
{
  template <int dim>
  class Function : public dealii::ParameterAcceptor,
                   public dealii::FunctionParser<dim>
  {
  public:
    Function(const std::string &section_name         = "",
             const std::string &expression           = "0",
             const std::string &function_description = "Function expression",
             const std::map<std::string, double> &constants = {},
             const std::string                   &variable_names =
               dealii::FunctionParser<dim>::default_variable_names() + ",t",
             const double h = 1e-8);
 
    void
    update_constants(const std::map<std::string, double> &constants);
 
    void
    update_expression(const std::string &expr);
 
  private:
    void
    reinit();
 
    std::string expression;
 
    std::map<std::string, double> constants;
 
    const std::string variable_names;
  };
} // namespace ParsedTools
#endif