Sure. Suppose that you can be given any hash at all, but only one slice at a time. So given the hash: 
{ a => { b1=> { c11 => vc11, c12 => vc12 }, b2 => { c21 => vc21, c22 =
+> vc22 } } }

[download]
you receive it one slice at a time in reverse order but with the level at which it is stored in the hash:
{ c21 => vc21, c22 => vc22 }, level=3
{ c11 => vc11, c21 => vc12 }, level=3
{ b2 => ?, b1 => ? }, level=2
{ a => ? }, level =1.

[download]
You could simply test for level = 1 and then process that recursively down to level 3 (avoiding processing at level 4 being an issue). But sometimes there are reasons why you can't wait or more likely, it is just too hard or messy to stack up all the context (in my case, this is specifically the other control and literal data within the stack frame at the point the slice is first interpreted inwards) and then have to unravel it later. I might end up having to do that though anyway unless someone has a better suggestion - my initial placeholder idea (just what first popped into my head) is just too inelegant I feel.

-M

Free your mind

In reply to Re^2: Nesting below emptiness and/or inverting a hash. by Moron
in thread Nesting below emptiness and/or inverting a hash. by Moron

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.