multiple-item traversal ranges

[dsimcha]

On 3/30/2011 7:56 PM, bearophile wrote:
> Jonathan M Davis:
>
>> Andrei is currently against making range-based functions work with opApply
>> because of the resulting increase complexity of the implementations. They were
>> really meant for ranges, not opApply. That doesn't necessarily mean that it's
>> a guaranteed "we don't want to do it," but it's definitely questionable.
>
> There is no "perfect design" here. I have suggested a compromise, where few basic functions (array(), walkLength()) work with every kind of iterable. Othrwise opApply becomes a third-class functionality and users need to write their own opApply-related functions.
>
> Bye,
> bearophile

Agreed.  Andrei's opinion is understandable if he thinks he'd have to 
implement these features and has better things to do.  I'd be willing to 
do the implementation work if the relevant compiler bugs/enhancements 
(2443, 4707, and maybe support for inlining delegates) get fixed so I 
can do it right.