Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

I believe that for this exact case (for @array) it is safe, despite the warning which has been there very long time, and despite there being no tests for it

I've done it in 5.005 and 5.016 and it worked as expected :) and its perfectly logical, it can't go wrong ( unlike shrinking the size of the array)

I believe the only situation for which the warning applies is shrinking the array (pop/unshift), or replacing parts of it (splice)
#9336: Changing a for array dumps core
Deleting specific element in array in FOREACH loop

In any case, warnings doesn't warn you about iterating over an array while you splice over it, but it could

In any case, the tests should be amended to test out the possibilities, to narrow down what is safe and what isn't :) So write up a test and perlbug-it brave soul :)

Also a Perl::Critic policy should be easy to write, see Perl::Critic::Policy::ValuesAndExpressions::UndefinedBehaviourMaybeQuoteit / $1 not quoted (value not frozen) undefined behaviour

In reply to Re: Is it safe to append to the array you are iterating over (yes) by Anonymous Monk
in thread Is it safe to append to the array you are iterating over by DrWhy

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (5)
    As of 2018-06-22 06:27 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (121 votes). Check out past polls.