Re: Custom Data Type

From: John Herbster \(TeamB\) ("John)
Date: 11/09/03 

Date: Sat, 8 Nov 2003 23:27:34 -0600

"John Ullom" <skygizmo@skygizmo.com> wrote
> I have a procedure that would be more elegant
> if I could create a custom data type.
>
> Here is my data type:
> type TWeekDay = 0..6;
>
> What I was hoping is that for example:
> var vStart : TWeekDay;
>
> begin
> vStart := 5;
> vStart := vStart + 3;
> end;

John, Why not create your own little IncWeekDay
function? Maybe something like this:

  Type TWeekDay = 0..6;

  function IncWeekDay(Inp: TWeekDay; i: integer): TWeekDay;
  var j: integer;
  begin
    j := (ord(Inp) + i) mod 7; {The ord() is really not needed.}
    If (j < 0) {Correct in case i is negative.}
      then j := j + 7;
  Result := TWeekDay(j); {The cast is really not needed here.}
  end; {UNTESTED}

Regards, JohnH

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