Only having read the two abstracts, it seems to me that the authors rely on a Scheme-like language that has continuations or at least coroutines. With coroutines, it's trivial to convert between an "enumerator" (callback) and a "stream" (list/iterator). Without a coroutine mechanism, it's not as easy. As you seem to have read the paper, can you maybe post a link to the actual paper or, even better, give an application of the automatic way discussed there in Perl?

Using the Coro.pm module, it's quite easy to have generators and to convert between enumerator and iterator, but Coro has the disadvantage of relying on a GPLed library and it doesn't (immediately) work on Win32. Without Coro, one has to manage the stack oneself and/or to create a large buffer for all values passed by the enumerator from what I know. But maybe the paper shows a technique I don't know (yet).

Update: I had another look at Coro, and it isn't under the GPL. I also found that half-support for Win32/MSVC is there, now. Yay! ;)

In reply to Re^4: Derangements iterator (callbacks) by Corion
in thread Derangements iterator by tye

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