I understand that TList is a list of pointers. What I cannot understand is why I can't do something like\
for i := 0 to AList.Count do begin if AList.Items[i]^ is TMyObject then with AList.Items[i]^ as TMyObject do
etc etc etc.
You can. You just need to tell the compiler that it is a TObject first.
The easiest way of doing that -- and arguably the best way -- is to use a TObjectList instead of a plain TList. Find that in the Contnrs unit in Delphi 5 and later.
This then allows the compiler to know that you are dealing with an object. not just a pointer to a block of memory. It needs to know it's an object so it knows that there is RTTI attached to this block of memory.
for i := 0 to AList.Count - 1 do begin if TObject(AList.Items[i]) is TMyObject then with TMyObject(AList.Items[i]) do
That code does not use RTTI. The "is" and "as" operators don't require RTTI -- at least not the RTTI that the $M compiler directive controls.
-- Rob
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