Super-dee-duper D features
Bill Baxter
dnewsgroup at billbaxter.com
Fri Feb 16 13:18:48 PST 2007
Bruno Medeiros wrote:
> Andrei Alexandrescu (See Website For Email) wrote:
>> Bill Baxter wrote:
>>>
>>> You're of course welcome to your opinion, but multiple assignment
>>> exists in many languages. So you're saying they're all wrong to have
>>> such a feature?
>>
>> No. It's good to have multiple assignments; it's annoying that Perl
>> prevents the option of grouping initializers with the data if I so
>> wanted:
>>
>> my $a = e1, $b = e2, $c = e3;
>>
>> I was just opining that
>>
>> foreach (a ; e1) (a2 ; e2) {}
>>
>> is clearer than:
>>
>> foreach (a ; b) (e1 ; e2) {}
>>
>>
>> Andrei
>>
>
> Ah, but then would you agree that your simultaneous foreach proposal
> would only serve the purpose of grouping variables next to their data?
> I.e., it wouldn't help in terms of simplifying code complexity (as it
> might happen in other languages, like Perl which you mentioned in
> another post), since D can currently do this:
>
> foreach (x,y ; transpose_view(reverse_view(foo),bar)
> //then why not this too?!
Oh, I wasn't thinking D could actually do this already. Is a generic
transpose_view possible using a variadic opApply? I don't think so but
maybe I'm wrong. You'd need
int opApply( int delegate(Args...) body ) {
. . .
}
Does that work?
--bb
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