On Thu, 2 Feb 2023, Ondrej Pokorny via fpc-devel wrote:
On 02.02.2023 10:15, Michael Van Canneyt via fpc-devel wrote:
On Thu, 2 Feb 2023, Ondrej Pokorny via fpc-devel wrote:
I myself cannot think of any real use case of constref other than hacks
like the FreeAndNil in recent Delphi versions:
procedure FreeAndNil(const [ref] Obj: TObject);
that needs the ref because it changes it to nil (so is not really a const
- it used to be an untyped var). As a result FreeAndNil allows you to
happily pass read-only properties to it that are then nilled.
Which is a clear violation of the concept of Const... :/
Exactly.
Probably an ill-advised "fix" to the problem that FreeAndNil accepted an
untyped var
and you could basically pass anything.
Michael.
_______________________________________________
fpc-devel maillist - fpc-devel@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
