14-Mar-2014 19:17, Andrei Alexandrescu пишет:
On 3/14/14, 4:37 AM, Daniel Murphy wrote:
"Walter Bright" wrote in message news:[email protected]...
> No, it doesn't, because it is not usable if C introduces any virtual
> methods.
That's what the !final storage class is for.
My mistake, I forgot you'd said you were in favor of this. Being able
to 'escape' final certainly gets us most of the way there.
!final is really rather hideous though.
A few possibilities discussed around here:
!final
~final
final(false)
@disable final
I've had an epiphany literally a few seconds ago that "final(false)" has
the advantage of being generalizable to "final(bool)" taking any
CTFE-able Boolean.
On occasion I needed a computed qualifier (I think there's code in
Phobos like that) and the only way I could do it was through ugly code
duplication or odd mixin-generated code. Allowing computed
qualifiers/attributes would be a very elegant and general approach, and
plays beautifully into the strength of D and our current investment in
Boolean compile-time predicates.
+1 for qualifier(bool_expression)
--
Dmitry Olshansky
