Empowering foreach with multiple aggregates
Daniel Keep
daniel.keep.lists at gmail.com
Sun Sep 9 05:24:14 PDT 2007
Janice Caron wrote:
> Wow! You're good!
He's downs.
>> static if(isArray!(T)) alias typeof(T[0]) IT;
>> else alias ParameterTypeTuple!(
>> ParameterTypeTuple!(
>> typeof(&T.init.opApply)
>> )[0]
>> )[$-1] IT;
>
> Sorry to jump threads here, but this is a really good example of why
> alias dst=src; would be a good thing. It took me a long time and a lot
> of counting parantheses to figure out that IT was being defined!
>
> Anyway - that is excellent.
>
> I guess the next question would be, can this trick be built into the
> language in an easy-to-use way. Or in Phobos?
I suspect not unless Walter adds stackthreads/coroutines to it first.
Then again, since it's so clean to use:
foreach (ref d, ref s; pair(dst, strng(src)))
It seems fine as a library method.
P.S. to downs: did you have that one lying around, or is this old work? :P
-- Daniel
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