[Issue 17440] Nullable.nullify() resets referenced object
via Digitalmars-d-bugs
digitalmars-d-bugs at puremagic.com
Thu Jul 6 05:25:15 PDT 2017
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?
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