Bug 8555 – Round Robin and Infinite Ranges

http://dlang.org/phobos/std_range.html#roundRobin As would be expected, RoundRobin goes into an infinite loop if the range is infinite; perhaps !isInfinite!R would be suitable to test against the input ranges? This may benefit other exhausting range functions also.

It's not a good idea to constrain the function unnecessarily. For example, you might want to construct an infinite round robin, but then take a finite number of elements from the start. e.g. auto r = roundRobin(cycle([0, 1]), cycle([0, 1, 2])).take(10); This should work, even though cycle is infinite. There's nothing wrong with infinite ranges, as long as you don't try to iterate them in their entirety :-)

roundRobin appears to work as documented, and accepting infinite ranges is a valid use case, as explained by Peter Alexander.