Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
So instead of returning (undef, sub{...}) I should've just returned (sub {...}).

The documentation is correct, returning your way might work, but is wrong according to the documentation. Instead I guess the important part you made wrong before is not returning a reference to a scalar for source code prefix as element 1. This is what I've been struggling with, which resulted in strange behaviour, like the returned filehandle in my returned list got read once, but not for a second file and such. Instead of returning a reference to a scalar, I tried to return undef, \'' or plain '', which all failed. When I started to really use a scalar, the return worked as documented: The file in my case got read using the handle and I could warn each line read in the given sub. It's important as well to really end the reading with 0 in the sub, else Perl will try to read data in some endless loop.

my $prefix = ''; # undef is valid as well return (\$prefix, IO::File->new($path, '<:bytes'), sub { $_ =~ /^1;\s*$/ ? 0 : 1 }, undef);

In reply to Re^3: Cancel/no-op a require by Pickwick
in thread Cancel/no-op a require by sedusedan

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 having an uproarious good time at the Monastery: (6)
    As of 2018-07-20 09:12 GMT
    Find Nodes?
      Voting Booth?
      It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?

      Results (427 votes). Check out past polls.