In Island/Oxytene, what does "seal record" mean?

Elements Oxygene
1

Without “seal”, the record type can be derived??

2

No, I believe records are always sealed, so adding the keyword has no effect (but is allowed, because why not?)

1 Like
3 
  UserVehicleMethodTable = public record 
  public
    Departure: DepartureEvent;
    Parked: ParkedEvent;
    Stalled: StalledEvent;
    Arrival: ArrivalEvent;
    Update: UpdateEvent;
    CarFollowing: CarFollowingEvent;
    TranitStop: TransitStopEvent;
    Position: PositionEvent;
    Fail: FailEvent;
  end;
  PUserVehicleMethodTable = ^UserVehicleMethodTable;

In above type of code, do I have to take care of the memory management of the record pointer, or Island GC will handle it for me?

How can I dynamically create an Island record, like Delphi’s new()?

5

Above record will not be GC handled no. If you want to manually allocate (And thus release) it, you can use something like:


    class method &NewRecord<T>(): ^T;
    begin 
      result := ^T(malloc(T));
      memset(^Byte(result), 0, sizeOf(T));
    end;
    class method FreeRecord<T>(aVal: ^T); 
    begin 
      free(^Void(aVal));
    end;
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6

Got it. I see - Island/Win32 on the native side is very close to C. Closer than Delphi, probably.

Thank you for the heads up.