[fpc-pascal] Checking if a TStringList already exists

[Michael Van Canneyt]

On Tue, 21 May 2019, Mattias Gaertner via fpc-pascal wrote:

> On Tue, 21 May 2019 16:47:28 +0100
> Graeme Geldenhuys <mailinglists at geldenhuys.co.uk> wrote:
>
>> [...]
>> I fully agree with what Michael said. You can't truly expect
>> applications developer to trail and error what needs to be done. It's
>> an LCL issue that the Lazarus project needs to fix. Delphi's VCL,
>> fpGUI Toolkit and MSEide+MSEgui doesn't require this. Proof that LCL
>> is doing something wrong or has a bad internal design that needs
>> fixing.
>
> I don't know what is wrong, with keeping a reference while it is
> being destroyed.

Because this should not matter.

By itself there is nothing wrong with it.

The point is that as a user, how am I supposed to know that I must use this instead of FreeAndNil ?

IOW, why would you need this ? Why does it make a difference ? Why doesn't Delphi need this ?

Michael.