Expression.hpp

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// This file is part of GranOO, a workbench for DEM simulation.
//
// Author(s)    : - Damien Andre       IRCER/UNILIM, Limoges France
//                  <damien.andre@unilim.fr>
//                - Jean-luc Charles   Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <jean-luc.charles@ensam.eu>
//                - Jeremie Girardot   Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <jeremie.girardot@ensam.eu>
//                - Cedric Hubert      LAMIH/UPHF, Valenciennes France
//                  <cedric.hubert@uphf.fr>
//                - Ivan Iordanoff     Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <ivan.iordanoff@ensam.eu>
//
// Copyright (C) 2008-2019 D. Andre, JL. Charles, J. Girardot, C. Hubert, I. Iordanoff
//
// This program 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.
//
// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
#ifndef GranOO_Math__Expressionhpp
#define GranOO_Math__Expressionhpp
 
#include <string>
 
#include "GranOO3/Math/Variable.hpp"
#include "GranOO3/Math/Exprtk.hpp"
#include "GranOO3/Core/TinyXml.hpp"
 
#include "GranOO3/Physic/Time.hpp"
 
namespace GranOO3
{
  namespace Math
  {
    class Expression
    {
    public:
      static Expression& glob(const std::string& id);
      static std::string class_ID() {return std::string("Expression");}
 
      static Expression* new_object(const TiXmlElement* el);
      static bool Check(const std::string& str);
 
    public:
      Expression(const std::string & exp);
      Expression();
      Expression(const Expression&);
      Expression& operator=(const Expression&);
 
      virtual ~Expression();
 
      void set(const std::string&);
      bool is_empty() const;
 
      std::string info() const;
      std::string str() const;
      double operator()(void);
      double value();
      double value() const;
 
      bool depend_on(double& var) const;
 
      double derivate(double& x, double step) const;
      double second_derivate(double& x, double step) const;
 
      double dt(Physic::Time& = Physic::Time::get());
      double ddt(Physic::Time& = Physic::Time::get());
 
    private:
    private:
      std::string _str;
      exprtk::expression<double> _expression;
    };
  }
}
#endif