https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12277

Ville Voutilainen <ville.voutilainen at gmail dot com> changed:

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                 CC|                            |ville.voutilainen at gmail dot 
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--- Comment #9 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
(In reply to Andrew Dixie from comment #7)
> With final, I believe the following dynamic_cast must always return NULL:
> 
> struct a1 { virtual ~a1() {} };
> struct a2 final { virtual ~a2() {} };
> 
> bool test(a1 *x)
> {
>         return dynamic_cast<a2 *>(x) != 0;
> }

If a1 is final, sure. Whether a2 is final is irrelevant.

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