BrowserUk,
You miss my point. I'm not talking about $a & $b.

I know, but that is where I can actually see a problem, not with @_.

When the comparator is first called, if no parameters are passed, then @_ should be empty and $_[0] is "undefined".

Yep, spot on. I auto-vivify $_[0] the first time it is called (which works great).

In which case, you are probably incrementing the address of the comparator itself

I am only vaguely getting at what you are trying to say here. The value of $_[0] is correctly being auto-vivified, incremented, and preserved between calls. I would think if it were the address of the comparator itself getting incremented then the second call wouldn't be possible.

I am not saying you are wrong because I definately respect your knowledge. I am just saying that nothing in any of my tests lead me to believe something is a miss with @_. The only thing that isn't behaving correctly is $a and $b. Even if it was with @_ - I still don't see how sort routine @list and sort { routine() } @list would make that much of a difference.

Cheers - L~R

In reply to Re^8: Sorting, recursion, and tail-call optimizations by Limbic~Region
in thread Sorting, recursion, and tail-call optimizations by Limbic~Region

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.