UserData.h

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/*

             *
            ***
           *****
   *********************       Mercenaries Engineering SARL
     *****************              Copyright (C) 2020
       *************
         *********        http://www.mercenaries-engineering.com
        ***********
       ****     ****
      **           **

*/
#pragma once

#include <memory>

#include "Export.h"
#include "StringView.h"

namespace maquina
{
  class NodeDelegate;
  class Value;

  // Base class for the user defined data to store in values.
  class MAQUINA_EXPORT UserData
  {
  public:
    virtual ~UserData() {};

    // Returns the user data type.
    virtual StringView type_name() const = 0;


    virtual std::shared_ptr<NodeDelegate> node_delegate(
      const std::shared_ptr<NodeDelegate>& /*parent*/,
      const StringView& /*name*/ ) const
    {
      return nullptr;
    }

    virtual bool has_node_delegate() const 
    {
      return false;
    }
  };
}