I have started to take a hard look at POE, using merlyn's excellent Column 41 as a learning tool.

I'm making progress, but part of the Perl syntax has me confused. Specifically, in one routine merlyn gets the kernel object using my $kernel = $_[KERNEL]; (Line 38) and then uses it with $kernel->yield("ready", "looping"); (Line 48) which is fine, except I'm not familiar with this use of $_.

Later on in the example, in another routine, he skips that nicety and just says $_[KERNEL]->yield("ready", "child done"); (line 65). I'm familiar with @_, but I'm unsure about where $_ comes from in that context.

Can someone elighten me? Thanks.

Alex / talexb / Toronto

"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds

Update 1: Fixed broken link; thanks zentara

In reply to POE and $_[KERNEL] by talexb

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!
  • 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, details, 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, summary, 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.