What's the point of bringing Scalar::Util::refaddr() et al to the party when == != (and all the other numeric comparators ... seem to manage just fine

Because it's the only solution in the whole thread that still works even in the presence of operator overloading? ;-)

use warnings;
use strict;

package Foo {
    my $x;
    use overload '<=>'=>sub{1}, 'cmp'=>sub{1}, '0+'=>sub{++$x};
}

my $x = bless {}, 'Foo';
my $y = $x;

print $x==$y ? "True\n" : "False\n";     # False

use Scalar::Util qw/refaddr/;
sub is { return refaddr $_[0] == refaddr $_[1] }

print is($x,$y) ? "True\n" : "False\n";  # True

[download]

In reply to Re^3: Python 'is' command by haukex
in thread Python 'is' command by betmatt

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.