This is getting more and more abstract and convoluted! Dynamic jump-levels? Come on...

I'm hacking for 30 years now and never needed this! :)

In this concrete case I would only call target() if a recursion level is really expected to be a jump target, that are 6 and 3 in your examples.

(If not possible in advance I would just step back single levels (return or goto) till I reach the desired one, Something like eval "LABEL:" would be my very last resort)

And even multiple calls to target are no problem, cause the goto always jumps to the last TARGET -label in the call-stack and local $target cares about restoring previous levels. This works w/o any string- eval.

I would never use with_return in the way you are showing, because

  1. it's not obvious what it does, I can name the target() function in a expressive way

  2. it has plenty of overhead, many of my recursions are long-running branch-and-bound searches which need to be optimized.

  3. the need to explicitly pass the return-sub along is IMHO very annoying

> Your code is a bit cheat - you implemented another subroutine, just to remember point in the stack.

Nope, it's like in the original code I gave. And as I said Return::MultiLevel just uses the same technique under the hood.

Anyway let's stop it here please! =)

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^11: Continuations in Perl - Returning to an arbitrary level up the call stack by LanX
in thread Continuations in Perl - Returning to an arbitrary level up the call stack by unlinker

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