typedef
  union {
    GB_TYPE type;
    GB_BOOLEAN _boolean;
    GB_INTEGER _integer;
    GB_LONG _long;
    GB_SINGLE _single;
    GB_FLOAT _float;
    GB_DATE _date;
    GB_STRING _string;
    GB_POINTER _pointer;
    GB_OBJECT _object;
    GB_VARIANT _variant;
  }
  GB_VALUE;

This structure represents a generic Gambas value.