[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'Objects' (#rtl)

# TCollection.Pack

Remove all >Nil pointers from the collection.

## Declaration

Source position: objects.pp line 417

`procedure TCollection.Pack;`

## Description

Pack removes all Nil pointers from the collection, and adjusts Count to reflect this change. No memory is freed as a result of this call. In order to free any memory, you can call SetLimit with an argument of Count after a call to Pack.

## Errors

None.

## See also

TCollection.SetLimit |  | Set maximum number of elements in the collection.

## Example

    Program ex21;

    { Program to demonstrate the TCollection.FirstThat method }

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

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

    Function CheckField (Dummy: Pointer;P : PMyObject) : Longint;

    begin
      If P^.GetField>56 then
        Checkfield:=1
      else
        CheckField:=0;
    end;

    begin
      C:=New(PCollection,Init(100,10));
      For I:=1 to 100 do
        begin
        M:=New(PMyObject,Init);
        M^.SetField(I);
        C^.Insert(M);
        end;
      Writeln ('Inserted ',C^.Count,' objects');
      Writeln ('first one for which Field>56  has index (should be 56) : ',
                C^.IndexOf(C^.FirstThat(@CheckField)));
      C^.FreeAll;
      Dispose(C,Done);
    end.