TCollection.IndexOf
Find the position of a certain item.
Declaration
Source position: objects.pp line 439
default
function IndexOf(Item: Pointer) : Sw_Integer; Virtual;
Description
IndexOf returns the index of Item in the collection. If Item isn't present in the collection, -1 is returned.
Errors
If the item is not present, -1 is returned.
See also
| Name | Description |
|---|---|
| TCollection.At | Return the item at a certain index. |
| TCollection.GetItem | Read one item off the stream. |
| TCollection.Insert | Insert a new item in the collection at the end. |
Example
Program ex24;
{ Program to demonstrate the TCollection.IndexOf method }
Uses Objects,MyObject; { For TMyObject definition and registration }
Var C : PCollection;
M,Keep : PMyObject;
I : Longint;
begin
Randomize;
C:=New(PCollection,Init(100,10));
Keep:=Nil;
For I:=1 to 100 do
begin
M:=New(PMyObject,Init);
M^.SetField(I-1);
If Random<0.1 then
Keep:=M;
C^.Insert(M);
end;
If Keep=Nil then
begin
Writeln ('Please run again. No object selected');
Halt(1);
end;
Writeln ('Selected object has field : ',Keep^.GetField);
Write ('Selected object has index : ',C^.IndexOf(Keep));
Writeln (' should match it''s field.');
C^.FreeAll;
Dispose(C,Done);
end.