weak_object.h

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#ifndef DD__WEAK_OBJECT_INCLUDED
#define DD__WEAK_OBJECT_INCLUDED
 
#include "sql/dd/string_type.h"  // dd::String_type XXX: temporary, debug-only
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
/**
  Base class for all data dictionary objects.
 
  @note This class may be inherited along different paths
        for some subclasses due to the diamond shaped
        inheritance hierarchy; thus, direct subclasses
        must inherit this class virtually.
*/
 
class Weak_object {
 public:
  // XXX: temporary, debug-only.
  virtual void debug_print(String_type &outb) const = 0;
 
 public:
  Weak_object() = default;
 
  Weak_object(const Weak_object &) = default;
 
  virtual ~Weak_object() = default;
};
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace dd
 
#endif  // DD__WEAK_OBJECT_INCLUDED