VariableReference.h

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#ifndef  _MADARA_VARIABLE_REFERENCE_H_
#define  _MADARA_VARIABLE_REFERENCE_H_


#include <string>
#include "madara/MADARA_export.h"
#include "madara/expression/ExpressionTree.h"
#include "madara/utility/ScopedArray.h"

namespace madara
{
  namespace knowledge
  {
    class ThreadSafeContext;
    class KnolwedgeBaseImpl;
    class Variables;

    namespace rcw
    {
      class BaseTracker;
    }

    class MADARA_Export VariableReference
    {
    public:
      friend class ThreadSafeContext;
      friend class KnowledgeBaseImpl;
      friend class Variables;
      friend class rcw::BaseTracker;

      VariableReference ();
      
      VariableReference (const VariableReference & rhs);

      ~VariableReference ();

      bool is_valid (void) const;

      void operator= (const VariableReference & input);
      
      bool operator== (const VariableReference & rhs) const;
      
      bool operator!= (const VariableReference & rhs) const;

      const char * get_name (void) const;

    private:
      
      void set_name (const std::string & name);
      
      utility::ScopedArray <const char> name_;

      knowledge::KnowledgeRecord * record_;
    };

    typedef std::vector <VariableReference>  VariableReferences;
  }
}

#include "VariableReference.inl"

#endif   // _MADARA_VARIABLE_REFERENCE_H_