Yes - that explains context. Now I also found it in the docs. Initially I was looking in Context - now I see it is described in Predicates.

I hope you don't mind that I'll ask another question - what is the signature of sleep? The documentation says "sleep($deadline) Executes after $deadline". So here is what I would expect to work: 

sub my_sleep(&)
{
   ( $deadline ) = context;
   print "sleeping ", $deadline, "seconds\n";
   &sleep($deadline);
}

[download]
But from the example you gave above (and the other ones in the POD) it seems that actually sleep takes the $deadline from the context and the parameter passed to it is actually a callback - is that right or I am totally confused? What does it do with the passed callback?

After having written that I read Re^5: IO::Lambda: call for participation - and it partially answers this and again I can see it described in the Predicates section. Somehow I did not notice it at the first reading - maybe I expected the predicates to be really simple mathematical logic predicates.

In reply to Re^7: IO::Lambda: call for participation by zby
in thread IO::Lambda: call for participation by dk

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.