That's a nice solution, but is there any particular reason to use an arrayref rather than a scalarref? It'd make the iterating code just a bit cleaner:

while( my $next = $iter->() ) {
    $next = $$next;
    ...
}

[download]

As opposed to:

while( my $next = $iter->() ) {
    ($next) = @$next;
    ...
}

[download]

"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.

In reply to Re^2: Dumb, non-question: How to return 'nothing'. by hardburn
in thread Dumb, non-question: How to return 'nothing'. by BrowserUk

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