https://issues.dlang.org/show_bug.cgi?id=18845

Manu <turkeyman@gmail.com> changed:

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           Keywords|                            |C++

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https://issues.dlang.org/show_bug.cgi?id=18845

Ethan Watson <gooberman@gmail.com> changed:

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                 CC|                            |gooberman@gmail.com

--- Comment #1 from Ethan Watson <gooberman@gmail.com> ---
See: The giant workaround I had to do for Binderoo for this very thing in my DConf 2017 talk.

I believe the reason classes always have a vtable is so safe casting is still guaranteed. But that's just an assumption.

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https://issues.dlang.org/show_bug.cgi?id=18845

--- Comment #2 from Manu <turkeyman@gmail.com> ---
What does "safe casting" mean?
You mean that it might require pointer adjustment?

I mean, it's absolutely necessary that when casting extern(C++) classes, that
some special logic is applied which may need to perform a pointer adjustment,
just like when casting C++ classes in C++ ;)
We can't escape that. We either need to support it, or it's just broken.

At very least, we should emit an error when an extern(C++) class is declared with no virtual members saying it's not supported.

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https://issues.dlang.org/show_bug.cgi?id=18845

Mathias LANG <pro.mathias.lang@gmail.com> changed:

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                 CC|                            |pro.mathias.lang@gmail.com

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https://issues.dlang.org/show_bug.cgi?id=18845

Mathias LANG <pro.mathias.lang@gmail.com> changed:

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                 CC|                            |timothee.cour2@gmail.com

--- Comment #3 from Mathias LANG <pro.mathias.lang@gmail.com> ---
*** Issue 18449 has been marked as a duplicate of this issue. ***

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https://issues.dlang.org/show_bug.cgi?id=18845

Iain Buclaw <ibuclaw@gdcproject.org> changed:

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           Priority|P1                          |P4

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