2013/11/10 Daniel Murphy <yebbl...@nospamgmail.com>
> "Kenji Hara" <k.hara...@gmail.com> wrote in message
> news:mailman.336.1384083327.9546.digitalmar...@puremagic.com...
> >
> > This is valid. Because not only strongly pure function will return unique
> > object.
> >
> > For example:
> > immutable(int)[] foo(int[] iarr) pure { ... }
> > int[] marr = foo([1,2,3]);
> > // foo will never return the arr argument (without unsafe cast).
> >
>
> This one is incorrect, the value returned from foo could be an immutable
> global. The unique conversion is only capable of changing non-mutable to
> immutable, not the other way around.
>
foo is pure, so it cannot return "immutable global".
Maybe you meant something like this?
>
> int[] foo(const(int)[] iarr) pure { ... }
>
Of course, both your case and mine are valid.
Kenji Hara
