Why operator 'in' has a limit?

procedure TForm1.Button1Click(Sender: TObject);
var
  t,r1,r2: Integer;
begin
  t := 359;
  r1 := 252;
  r2 := 253;
  if r2 in [r1..t-1] then  // 252..359 so, 253 is include
    ShowMessage('Found')
  else
    ShowMessage('Not found');  // <<<<<<< not found
end;

Marcos Douglas

Marcos Douglas wrote

Why operator 'in' has a limit?

Turn on range checking and you will get a range check error (turning on range checking when you get strange results should always be the first reflex). Sets are limited to 256 elements because of implementation reasons. One day, large sets may be supported, but that will probably not happen any time soon.

Jonas

Marcos Douglas wrote

Why operator 'in' has a limit?

It is limited to byte-sized types, i.e, max 256 elements.

Michael.

Ok, thank you.

Marcos Douglas