text: #ifndef DEFN_H
  #define	DEFN_H
  
  // A macro to disallow the copy constructor and operator= functions
  // This should be used in the private: declarations for a class
  #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
    TypeName(const TypeName&);               \
    void operator=(const TypeName&)
  
  namespace mple{
  
  typedef unsigned int Qmid;
  typedef unsigned int zorder;
  typedef unsigned int Tid;
  typedef unsigned int Qid;//na kratame ti einai to query (type)??
  
  
  
  }
  #endif	// DEFN_H
  