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Re: How does 'goto LABEL' search for its label?

by Athanasius (Canon)
on Jan 16, 2013 at 13:59 UTC ( #1013576=note: print w/ replies, xml ) Need Help??

in reply to How does 'goto LABEL' search for its label?

From the Camel Book, 4th Edition, page 149:

The goto LABEL form finds the statement labeled with LABEL and resumes execution there. It can’t be used to jump into any construct that requires initialization, such as a subroutine or a foreach loop. It also can’t be used to jump into a construct that has been optimized away.... It can be used to go almost anywhere else within the current block or any block in your dynamic scope (that is, a block you were called from). You can even goto out of subroutines, but it’s usually bettter to use some other construct.

Update: See also the similar discussion on page 881, and note (for whatever it’s worth) the following rather cryptic comment in the section “Time Efficiency” on page 692:

  • Avoid goto. It scans outward from your current location for the indicated label.

Hope that helps,

Athanasius <°(((><contra mundum Iustus alius egestas vitae, eros Piratica,

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