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Re: private recursive subroutinesby blokhead (Monsignor) |
on May 10, 2007 at 16:28 UTC ( [id://614684]=note: print w/replies, xml ) | Need Help?? |
This is reminiscent of a common trick in (untyped) lambda calculus to make a function recursive -- called a Y combinator.
In fact, using a standard Y combinator, you don't have to change the public interface to the function -- you use currying to fix the extra parameter that is introduced: I also like this better than your example because it doesn't use the $func variable confusingly in 2 different scopes (when I saw your original code, I had to think hard about whether you introduced a cyclic reference for $func). Update: I should add that this won't result in a cyclic reference like the approaches in the previous replies. See also: Re: recursive anonymous subroutines and this entry from Aristotle's use.perl journal. blokhead
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