On Sat, Nov 24, 2018 at 05:48:16PM +0000, Stanislav Blinov via
Digitalmars-d-learn wrote:
> On Saturday, 24 November 2018 at 17:43:35 UTC, Jonathan M Davis wrote:
> > On Saturday, November 24, 2018 9:28:47 AM MST Stanislav Blinov via
> > Digitalmars-d-learn wrote:
[...]
> > > enum Foo
> > > {
> > > a,
> > > b,
> > > c = {
> > > version(linux) return 42;
> > > else version(Windows) return 54;
> > > } ()
> > > }
> > >
> > > /pedantry
> >
> > LOL. That's an interesting trick. It's ugly and hacky, but it does
> > work around the problem.
>
> :)
That's an awesome trick! Genius.
> > I'm still inclined to think though that it should be legal to just
> > use version directly in the member list.
>
> Yup. UDAs did get in there eventually, and version should too.
I think this would be a trivial DIP, by making it such that a version
block inside an enum would lower to the above code. Of course, it could
be taken further: the above trick doesn't quite handle this case:
enum E {
a,
version(Windows) {
b, c
}
version(Posix) {
d
}
}
But this looks like such an antipattern that it probably should be
written differently anyway, or just generated via a string mixin.
T
--
Knowledge is that area of ignorance that we arrange and classify. -- Ambrose
Bierce
