'$' and opDollar

[Simen kjaeraas]

spir <denis.spir at gmail.com> wrote:

> On Sat, 01 Jan 2011 19:27:57 +0100
> Don <nospam at nospam.com> wrote:
>
>> > AFAIK, using '$' for custom collection types is not yet possible:  
>> oDollar is simply not implemented (correct?). But why do we need it? I  
>> do not understand the logic requiring an opDollar special method to  
>> "desugarise" the '$' operator. For me, '$' simply means length, so I  
>> would be fully happy with the simple rewrite of
>> >     coll[$]  coll[$-i] coll[i..$]
>> > to
>> >     coll[coll.length]   coll[coll.length-i]   coll[i..coll.length]
>>
>> The problem is with multi-dimensional indices.
>> Consider:
>> a[$-1][$-2];
>>
>> There are two different values for $.
>
> Right. I don't understand why a solution like length does not apply, and  
> why opDollar would. In the above example, both a and a[$-1] should have  
> a length member or an opDollar method. What do I misinterpret?

I believe Don made a typo:

a[$-1, $-2];


-- 
Simen