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Re^4: Trouble getting size of list returned from sub

by Anonymous Monk
on Nov 26, 2012 at 15:24 UTC ( #1005695=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Trouble getting size of list returned from sub
in thread Trouble getting size of list returned from sub

Actually, it is not a scoping issue

Sure it is

By that logic, this should also save memory:

No, you're copying the list, same as map used to do, even in void context, instead of merely aliasing it -- @_ is alias until you copy it, but you figured that out yourself in Re: Trouble getting size of list returned from sub


Comment on Re^4: Trouble getting size of list returned from sub
Re^5: Trouble getting size of list returned from sub
by ColonelPanic (Friar) on Nov 26, 2012 at 15:40 UTC

    Sure it is

    I responded to your earlier claim that memory from lexical variables is returned to the OS, based on both a statement from the Perl FAQ and evidence from testing. So, simply continuing to assert your previous position without any new argument is not going to cut it. I would be happy to learn how I am wrong on this, but if I am wrong please explain why.

    No, you're copying the list...

    This appears to be a response to the subroutine solution I posted below. Again, the evidence from testing seems clear enough--it uses less memory than the solutions that explicitly or implicitly make a copy of the array. In this case, my assumption was that the list returned from the first function call is left on the stack and used as the arguments for the second function call. @_ then refers directly to the stack, and thus no new copy is made. Again, I would be happy to be proved wrong on this.

    Note: I'm assuming you're the same Anonymous Monk as the previous one here. My apologies to both of you if that is incorrect.



    When's the last time you used duct tape on a duct? --Larry Wall

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