As some of you may have understood by some posts of mine I'm pursuing some interest in object orientation in Perl...

Now, I've read a few documents about fly-weight and inside-out objects, and while I understand perfectly

  1. which is the problem that the latter ones try to cope with, and why they succeed in doing so,
  2. that the latter ones are a generalization (or a special case?) of the former ones,
I don't see which is the actual advantage of fly-weight objects over "standard" ones, apart some moderate amount of conceptual cleanliness. Or is there something obvious that I'm missing?

Question #2

Also, I'm very curious as to know wether someone has ever met any situation in which it has been useful or sensible to have part of the data "inside" the object and part of it stored in a package lexical: possibly by still using the object's blessed reference as in index into a hash, or by some other technique...

Perhaps, thinking of a reblessed object, as suggested to me in Re: Instance data inheritance?, such a technique may be used to include additional attributes to the child object without having to fiddle with the parent one's internals...

In reply to Doubt about fly-weight objects. by blazar

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.