[Issue 17440] Nullable.nullify() resets referenced object

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17440

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to Marenz from comment #0)
> I am not sure if it is desired, but it was highly unintuitive and unexpected
> for me:
> 
> If you use Nullable with a class type and call .nullify(), all members of
> the class are set to the uninitialized state. Example:

That is almost certainly not intended, and (as RazvanN wrote) is because the
Nullable implementation makes no attempt to do anything different when used
with a class. What happens is that it calls object.destroy on the class, which
instead of setting the class reference to null, it clobbers the class data.

However, I think your example is also incorrect, because it accesses the value
of a nullified object.

Is there any particular reason you need to use Nullify with a class type
instead of simply using the class type directly and use "null" to indicate the
unset state?

--