freepascal.compiler/docs/objectex/ex34.pp

Program ex34;

{ Program to demonstrate the TCollection.AtInsert method }

Uses Objects,MyObject; { For TMyObject definition and registration }

Var C : PCollection;
    M : PMyObject;
    I : Longint;

Procedure PrintField (Dummy: Pointer;P : PMyObject);

begin
  Writeln ('Field : ',P^.GetField);
end;


begin
  Randomize;
  C:=New(PCollection,Init(120,10));
  Writeln ('Inserting 100 records at random places.');
  For I:=1 to 100 do
    begin
    M:=New(PMyObject,Init);
    M^.SetField(I-1);
    If I=1 then
      C^.Insert(M)
    else
      With C^ do 
        AtInsert(Random(Count),M);
    end;
  Writeln ('Values : ');
  C^.Foreach(@PrintField);   
  Dispose(C,Done);
end.