What's the deal with __buck?

[Jarrett Billingsley]

On Thu, Jan 29, 2009 at 12:48 PM, Andrei Alexandrescu
<SeeWebsiteForEmail at erdani.org> wrote:
> BCS wrote:
>>
>> Hello Bill,
>>>
>>> I guess what's required is the ability to define the __dollar in the
>>> scope of a class/struct/template.
>>
>> I think that is the correct solution.
>
> Ok, thanks to all. So __dollar is looked up at module scope for anything
> that's not a built-in array.
>
> I thought some more about it and I think there's no need for __dollar.
> It's enough that:
>
> a) In slice expressions and index expressions with one argument, $ expands
> to value.length, where value is the object being indexed/sliced (if an
> unnamed temporary, the value is of course only evaluated once)
>
> b) In index expressions with multiple arguments, $ expand to
> value.length(i), where i is the zero-based argument position.
>
> This is exactly enough what's needed to make it all work. Infinite
> ranges may define a symbolic infinite length and overload slicing on it.

Sounds good.  Question - since length will work for multiple indices,
will it ever be possible to have .. multiple slices?

a[x1 .. x2, y1 .. y2] = b;