jryan,
Again, I am at the conference so I don't have the time to give you a proper response. The second one, which is more memory efficient, only requires as many nodes on the stack as the max depth of the tree. It does this by creating an iterator (one item) for the stack instead of a list of nodes (many) to visit. You then work through that iterator before moving on. This is a poor explanation - I know, but I won't be available to explain in detail until Thursday.

Cheers - L~R

In reply to Re^3: Eliminating Recursive Tree Walking by using MJD-style Infinite Streams? by Limbic~Region
in thread Eliminating Recursive Tree Walking by using MJD-style Infinite Streams? by jryan

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.