Is a valid answer "never, and if I see code that re-blesses, I make sure it gets red flagged"? I didn't see that in your poll, but that's would I would check off.

Re-blessing can be very useful way to inactivate destroy your object while it hasn't been destroyed. Imagine, for example, DBI's database connection handles. For this contrived case, assume that connections never die except by explicit connection from your own side. After $dbh->disconnect, they're mostly useless. If they were blessed into another class, and already cleaned up internally, a check for connection at the beginning of each method is no longer needed. Great for performance, great for keeping your code clean. And the clean code would inspire me to add better diagnostics: instead of just "prepare on an inactive database handle", you could add "(inactive because of ->disconnect in foo.pl line 15)". Possible without reblessing, but not as nice.

Juerd # { site => 'juerd.nl', plp_site => 'plp.juerd.nl', do_not_use => 'spamtrap' }

In reply to Re^2: Re-blessing || Re-constructing objects by Juerd
in thread Re-blessing || Re-constructing objects by blogical

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.