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

Comment on

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

Dear monks,

I'll confess to feeling rather foolish right now. I have to work with a sub that is returning a list directly, and I don't need the contents of the list; just the number of elements, but I can't figure out how to do so without a temp variable. Here's a simplified example:

sub good { my @a = qw/zero one two/; @a } sub bad { qw/foo bar baz/ } say scalar good(), "\t<== what I want"; say scalar bad(), "\t<== not"; __END__ Output: 3 <== what I want baz <== not

I can accomplish what I want with this clumsy mess:

{ my @temp = bad(); say scalar @temp; }

Is there no way to avoid the temp variable? And will Perl actually create a copy of the list in that case? My typical solution set is in the thousands.

As for the sub itself, it's someone else's XS code that I'm loathe to modify (not just something I can stick a wantarray in...), but I will if absolutely necessary.

In reply to Trouble getting size of list returned from sub by wanna_code_perl

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!
  • 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 the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (5)
    As of 2015-10-06 22:53 GMT
    Find Nodes?
      Voting Booth?

      Does Humor Belong in Programming?

      Results (163 votes), past polls