Is there any way to turn this function into a generic function for records?

Hello guys

I have this function that Shaffler my array of record

procedure DoSwap(var s1, s2: TCadVb);
var
  tmp: TCadVb;
begin
  tmp := s1;
  s1  := s2;
  s2  := tmp;
end;


procedure ShuffleArrayCadVb;
var
 i, j : Integer;
Begin
  for i := Low(CadVb) to High(CadVb) do
  begin
    j := Random(High(CadVb) - Low(CadVb) + 1) + Low(CadVb);
    if i <> j then
       DoSwap(CadVb[i], CadVb[j]);
  end;
End;

Open in new window


But I'd like to turn it into in a generic function for any kind of record. Something like this:

procedure ShufflerArray(variable: record)

is it possible? if so, how to?

Thanks
Alex
LVL 1
hidrauAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

mlmccCommented:
If you have assignment defined for the records then the code as written should work just by adding the parameter as an array of the records.

mlmcc
0
hidrauAuthor Commented:
Could you give me an example?

thanks
0
Sinisa VukSoftware architectCommented:
There is no need to swap large memory records - it is more efficient and faster to shuffle indexes itself:
Small example build on top of your code:
type
  TCadVb = record
    a: Integer;
  end;
  TIntArray = array of Integer;

procedure DoSwap(var s1, s2: Integer);
var
  tmp: Integer;
begin
  tmp := s1;
  s1  := s2;
  s2  := tmp;
end;

procedure ShuffleIdxArray(iArrSz: Integer; var idxArr: TIntArray);
var
 i, j : Integer;
begin
  SetLength(idxArr, iArrSz);
  //fill indexed
  for i := Low(idxArr) to High(idxArr) do
  begin
    idxArr[i] := i;
  end;
  //shuffle
  for i := Low(idxArr) to High(idxArr) do
  begin
    j := Random(High(idxArr) - Low(idxArr) + 1) + Low(idxArr);
    if i <> j then
       DoSwap(idxArr[i], idxArr[j]);
  end;
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  CadVb: array of TCadVb;
  idxArr: TIntArray;
  i: integer;
begin
  SetLength(CadVb,3);
  CadVb[0].a := 2;
  CadVb[1].a := 1;
  CadVb[2].a := 3;

  ShuffleIdxArray(Length(CadVb), idxArr); //go shuffle indexes

  Memo1.Lines.Clear;
  for i := Low(CadVb) to High(CadVb) do
  begin
    Memo1.Lines.Add(IntToStr(CadVb[idxArr[i]].a));
  end;
end;

Open in new window


... this way CadVb could be anything.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
hidrauAuthor Commented:
Thanks very much for your example
It helped me a lot
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.