VariableReference.h

Go to the documentation of this file.

#ifndef  _MADARA_VARIABLE_REFERENCE_H_
#define  _MADARA_VARIABLE_REFERENCE_H_


#include <string>
#include <cstring>
#include "madara/MadaraExport.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;

      using pair_ptr = KnowledgeMap::value_type *;

      VariableReference () = default;

      VariableReference (pair_ptr entry);

      bool is_valid (void) const;

      bool operator== (const VariableReference & rhs) const;

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

      const char * get_name (void) const;

      KnowledgeRecord *get_record_unsafe (void) const;

      void assign (pair_ptr entry);

    private:
      pair_ptr entry_ = nullptr;
    };

    typedef std::vector <VariableReference>  VariableReferences;

    struct VariableReferenceMapCompare
    {
      bool operator()(const char *l, const char *r) const {
        return std::strcmp(l, r) < 0;
      }
    };

    typedef std::map <const char *, VariableReference,
            VariableReferenceMapCompare> VariableReferenceMap;
  }
}

#include "VariableReference.inl"

#endif   // _MADARA_VARIABLE_REFERENCE_H_