Michele Dondi writes:
> Speaking of subs, and especially recursive ones which have been
> mentioned en passant earlier, I have another question "of mine": I
> know that in the vast majority of cases this won't be useful in any
> way, but in the body of a (possibly anonymous) sub/block, will there
> be some sort of identifier to refer to itself? I mean, in such a way
> to be able create anonymous recursive functions. In Perl5 it's doable
> by means of some trickery that involves an assignment, anyway.
It used to be &_. But that's changing now to be aliased to the slurpy
block if one exists, and to the target sub of a wrapper.
The new alternative is MY.sub. I suppose that could return the current
actual sub, so if you're using a pointy sub you have to say MY.block or
something. But it's one of those two.
> Thinking of it better lexicals will be in package MY, right, so a possibly
> not too out of question choice may be MY::_self (with underscore to avoid
> unwanted collisions with user stuff). Something like (hopefully):
>
> print sub -> $n {
> # Admittedly stupid example!
> return $n if $n<=1;
> MY::_self($n-1) + MY::_self($n-2);
> }.(10);
You have a redundancy there: "sub" and -> both mean the same thing, so
use one or the other. If you use "sub", the argument list has to be
parenthesized.
Luke
