Why does the following work in DMD 2.080 and LDC 1.10, but not in DMD 2.081 and LDC 1.11 beta:

https://run.dlang.io/is/dSVruv

And is there a way to enforce the cast like a static_cast in C++?

On Wednesday, 1 August 2018 at 16:25:28 UTC, Hakan Aras wrote:

>
> https://run.dlang.io/is/dSVruv
>

Whoops, that was the wrong one. It's fixed now.

On Wednesday, 1 August 2018 at 20:10:44 UTC, Hakan Aras wrote:
> On Wednesday, 1 August 2018 at 16:25:28 UTC, Hakan Aras wrote:
>
>>
>> https://run.dlang.io/is/dSVruv
>>
>
> Whoops, that was the wrong one. It's fixed now.

https://issues.dlang.org/show_bug.cgi?id=19134

As a workaround remove static, as that causes y to be initialised at compile time. static here has nothing to do with static_cast in C++.

The analogy to a static_cast would be

const X x = new Y();

casting up the hierarchy, as opposed to dynamic casting down the hierarchy.

On Thursday, 2 August 2018 at 01:39:58 UTC, Nicholas Wilson wrote:

> https://issues.dlang.org/show_bug.cgi?id=19134
>

I wasn't quite sure whether it's a bug since it happens in both compilers. Thanks for opening the issue.

> As a workaround remove static, as that causes y to be initialised at compile time.

I do want it at compiletime though.

> static here has nothing to do with static_cast in C++.
> The analogy to a static_cast would be
>
> const X x = new Y();
>
> casting up the hierarchy, as opposed to dynamic casting down the hierarchy.

Sorry, I actually meant a reinterpret_cast. I always get those mixed up. But now that I look at it again I don't see how that would help me, since my code isn't the one trying to to casting.

On Thursday, 2 August 2018 at 02:13:41 UTC, Hakan Aras wrote:
> On Thursday, 2 August 2018 at 01:39:58 UTC, Nicholas Wilson wrote:
>
>> https://issues.dlang.org/show_bug.cgi?id=19134
>>
>
> I wasn't quite sure whether it's a bug since it happens in both compilers. Thanks for opening the issue.
>

For future reference the only time you should consider LDC/GDC distinct from DMD is codegen, i.e. compiler causes your code to crash. This is a frontend bug so it affects all the major compilers.

>> As a workaround remove static, as that causes y to be initialised at compile time.
>
> I do want it at compiletime though.
>
>> static here has nothing to do with static_cast in C++.
>> The analogy to a static_cast would be
>>
>> const X x = new Y();
>>
>> casting up the hierarchy, as opposed to dynamic casting down the hierarchy.
>
> Sorry, I actually meant a reinterpret_cast. I always get those mixed up. But now that I look at it again I don't see how that would help me, since my code isn't the one trying to to casting.

Ah, unfortunately you're stuck then.

On Thursday, 2 August 2018 at 02:13:41 UTC, Hakan Aras wrote:
> I do want it at compiletime though.

Totally understandable; that's a regression and needs to be fixed. See https://github.com/dlang/dmd/pull/8362#pullrequestreview-142565787.