Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

Comment on

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

is there a magic way to call an anonymous subroutine within its own body without binding it to a coderef ?

I'd like to do something like that:
(sub {... magic(...) ... )->(args)
where magic would refer to the anonymous sub being defined.

The closest I came so far was
use strict; { my $coderef; ($coderef = sub { ... $coderef->(...) ...)->(args); }
which strikes me as inelegant and potentially leaky. Here is some runnable (if silly) code :
use strict; # direct call of unbound non recursive anonymous subroutine my $res = (sub{ print @_[0] + @_[1] . "\n\n";})->(100,1); # need to bind to a coderef if recursive ? { my $coderef; ($coderef = sub {return unless $_[0] > 0; print "$_[0]\n"; $codere +f->($_[0]-1)})->(4); }

In real life, I sometimes need to call a recursive function or subroutine to process a tree-like structure. It gets called only once, at a specific point, and should (IMO) not need to be graced with a name or bound to a coderef (much in the spirit of a map {...} @somearray).

Any thoughts ? TIA.

In reply to recursive anonymous subroutines by Daryn

Title:
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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (3)
    As of 2014-09-20 06:32 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (155 votes), past polls