More magical AA semantics

[Andrei Alexandrescu]

On 1/12/13 5:51 AM, monarch_dodra wrote:
> On Saturday, 12 January 2013 at 04:24:01 UTC, deadalnix wrote:
>> On Friday, 11 January 2013 at 13:50:33 UTC, monarch_dodra wrote:
>>> I find that with LTR, you end up with a value (T.init), that you
>>> never actually put into your array. IMO, that means something went
>>> wrong somewhere. This is particularly relevant with "++a[0]".
>>>
>>
>> Not necessarily, as the computation made for an assignation isn't the
>> one made in order to get the value.
>>
>> It make sense that such expression fail. As long as the AA as the key
>> are computed before the value and in that order.
>
> I guess I can see it either way. My only gripe though is that:
> "a[0] = a[0] + 5;"
>
> Could never work if AA's were a "true" library type. I think this is a
> problem, if the plan is to one day completely move AA's out of the
> compiler.
>
> That, and for generic programming, it means my user written HashMap!
> will never be able to have AA's semantics.

But a[0] += 5 can be made to work.

Andrei