>> If the items in the collection are unblessed scalars, you can compare them
>> directly. The more "interesting" case is where the items are blessed scalars
>> (or "objects"). The default comparison is "==".

Class::DBI lets you do a simple "eq" test for sameness of database objects.

It uses overload to return an encoded key value in a string context, so that $a eq $b works anywhere that primary keys have been declared and both are from the same table.

Update: This overloading leads to a trivial Schwartzian Transform: @t = map { [$_, "$_"] } @u, potentially making any sorting or duplicate checking lightening fast!!

In reply to Re^2: OO Identity Crisis by snoopy
in thread OO Identity Crisis by tlm

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.