Shouldn't casting an object to void* be considered @safe?
Joseph Rushton Wakeling
joseph.wakeling at webdrake.net
Sat Dec 14 17:25:25 UTC 2019
On Friday, 13 December 2019 at 08:05:53 UTC, Andrej Mitrovic
> However, I don't see this cast as being unsafe. Casting a class
> object to a `void*` doesn't break the type system by itself.
> You cannot assign a `void*` to any other pointer type without
> an additional cast, and that additional cast would be the
> unsafe one. Additionally, you cannot reference a `void*`, so as
> far as I can see it's fairly safe to use in @safe code.
> Wouldn't it make sense to allow casting reference types to
> `void*` in @safe code? Are there edge-cases I haven't
Surely where code has a cast to `void*` and then later back to
some other pointer type, its overall safety is dependent on what
happens at both ends. The safety of the cast from `void*` cannot
be validated by the developer without knowing how the cast _to_
`void*` was done.
Making a cast to `void*` unsafe is therefore an important push to
the developer to say, "You need to look at this and validate what
you're doing against how you use it later."
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