Rust switches to external iteration

[Jonathan M Davis]

On Thursday, July 04, 2013 20:23:01 Peter Alexander wrote:
> To be fair, most of the time all you want to do is iterate over
> the range, so while they aren't powerful, they are sufficient
> most of the time.

ll pure input ranges are really good for is simple iteration, because it's 
_frequently_ the case you need at least a forward range in order to do much in 
the way of algorithms with ranges, so unless you're just not using 
std.algorithm and its ilk much, I don't see how you could possibly think that 
pure input ranges weren't anything but annoying. There's just so limiting in 
comparison to every other range type that I think that they should be avoided 
as much as possible.

Sometimes, you're stuck, because the nature of the type that you're dealing 
with forces it to be a pure input range, but you just can't take advantage of 
many algorithms with pure input ranges, which means that you have to write a 
lot more code or use std.array.array in order to use the various algorithms, 
forcing you to allocate when it should be completely unnecessary.

If all you're doing with ranges is iteration, then you're under-utilizing them 
IMHO.

- Jonathan m Davis