> On Oct 13, 2019, at 5:58 AM, Sven Barth via fpc-pascal
> <fpc-pascal@lists.freepascal.org> wrote:
>
>> Delphi does not allow it:
>>
>> [dcc32 Error] Project1.dpr(18): E1019 For loop control variable must be
>> simple local variable
>>
>> I don't think this should be allowed, either.
>
> Same.
Why not?
I just had this problem on 9/26, search for “for-in loop cast”. What if I have
a list of TObjects I want to iterate? I know TMyClass is safe to use but the
compiler complains so I override it with a typecast. If you take that away I’ll
have to do tons of casting outside of the loop.
var
arr: specialize TFPGObjectList<TObject>;
obj: TMyClass;
begin
arr := specialize TFPGObjectList<TObject>.Create;
arr.Add(TObject.Create);
// Incompatible types: got "TObject" expected "TMyClass"
for obj in arr do
begin
end;
Regards,
Ryan Joseph
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