> I was thinking of something like this actually:
> my $iterator = $set->iterator
> while ( my $dt = $iterator->next ) { ... }
>
> The iterator() method may need to take some
parameters, like "start" and "end" for infinite sets,
as well possible a direction parameter as well.
> It will return an object of the
DateTime::Set::Iterator class, though it's possible
there will be a need for multiple subclasses of that
class (I don't know yet).
>
> BTW, how does Set::Infinite decide the "min" and
"max" elements for an infinite set? Obviously, min
and max methods for the set are useful.
> Does DateTime::Set get that for free from
Set::Infinite?
Yes, min and max are already there.
Getting min/max of an infinite set is not a problem:
if the set is unbounded you get infinity, otherwise
you get a number.
Set::Infinite does backtracking to solve more complex
cases, like when you have intersections/unions of
infinite sets. It might also return undef, meaning
"don't know".
By "multiple subclasses", do you mean
DateTime::Set::Iterator, DateTime::Span::Iterator,
DateTime::SpanSet::Iterator ?
I don't think we need start/end parameters, because
you could use a DateTime::Span for that purpose.
I'd use next/previous methods instead of a direction
parameter (but I've never needed 'previous').
