[phobos] length implementation for Range

[Andrei Alexandrescu]

I think the length should be a property.

Andrei

Masahiro Nakagawa wrote:
> Hi list,
> 
> This post is my first post at Phobos ML :)
> 
> I have one question about hasLength.
> 
> Current implementation from std.range:
> -----
> template hasLength(R)
> {
>       enum bool hasLength = is(typeof(R.init.length) : ulong) &&
>           !isNarrowString!R;
> }
> -----
> This implementation has following issues.
> 
> http://d.puremagic.com/issues/show_bug.cgi?id=2873
> http://d.puremagic.com/issues/show_bug.cgi?id=3508
> 
> But, hasLength returns true when length method is marked as @property.
> 
> We should fix the above issue or length method should be marked as 
> @property?
> If latter, some ranges in phobos are incomplete.
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