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TCollection.LastThat function

Member of TCollectionIn unit Objects

Return last item which matches a test.

Declaration

pascal
function LastThat(Test: TCallbackFunBoolParam): Pointer

Description

This function returns the last item in the collection for which Test returns a non-nil result. Test is a function that accepts 1 argument: a pointer to an object, and that returns a pointer as a result.

Errors

None.

See also

Example: ex25

pascal
Program ex21;

{ Program to demonstrate the TCollection.Foreach 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 ('Last one for which Field<56  has index (should be 54) : ',
            C^.IndexOf(C^.LastThat(@CheckField)));
  C^.FreeAll;
  Dispose(C,Done);
end.

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.