Daniel Keep Wrote:
> >> bool isEmptyString(string str) {
> >> static if (str == "") return true;
> >
> > It works if you use 'if' instead of 'static if', oddly.
> >
> >> return false;
> >> }
> >>
> >> void main()
> >> {
> >> static if (isEmptyString(""))
> >> {
> >> int x = 1;
> >> }
> >> }
> >>
> >>
> >> test.d(5): Error: expression str == "" is not constant or does not
> >> evaluate to a bool
> >> test.d(11): Error: cannot evaluate isEmptyString("") at compile time
> >> test.d(11): Error: expression isEmptyString("") is not constant or does
> >> not evaluate to a bool
> >
> > Be sure to report this on Bugzilla: http://d.puremagic.com/issues/
>
> I don't think this is a bug in DMD.
>
> It can't execute it at compile-time because it CANNOT COMPILE IT.
>
> str is a run-time argument. static if requires a compile-time expression.
>
> You can't feed runtime constructs to compile-time ones. Evaluating a
> function at compile time doesn't change that.
That's a shame. This distinction doesn't make sense to me -- it is clearly
possible to know value of this function at compile time and there's no way to
change the result at run time.
If it's not a bug, I've filed it as feature request then:
http://d.puremagic.com/issues/show_bug.cgi?id=3209
