In the documentation, it's made to look like you can extend or override methods provided by URI but from what I can tell it does nothing of the sort. Take this, for example, which emulates what is in the documentation:

{
  package MyURIRole 0.000001;

  use Moose::Role;

  requires 'host';
  requires 'path';

  sub print_hi {
    my $s = shift;
    print "hi\n";
  }
}

{ 
  package MyURI 0.000001;

  use Carp;
  use Moose;
  use URI;

  has 'uri' => ( is => 'ro', isa => 'URI', handles => 'MyURIRole', );

}

#! /usr/bin/env perl
use MyURI;

use strict;
use warnings;

my $uri = MyURI->new( uri => URI->new('http://www.perl.com/the_path'))
+;
print $uri->host;
print "\n";
print $uri->path;
print "\n";
$uri->print_hi;

[download]

From the documentation's explanation, I would expect the $uri->print_hi to print out "hi". Instead, I get an error:

Can't locate object method "print_hi" via package "URI::http" at inline delegation in MyURI for uri->print_hi (attribute declared in MyURI.pm at line 7) line 18.

So I'm not sure why the documentation is suggesting that using a role name with handles is a good way to delegate when using another package like URI. What is to be gained from it? Am I missing something?

$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate Priest";
$nysus = $PM . ' ' . $MCF;
Click here if you love Perl Monks

In reply to Re^4: Delegating to a role in Moose by nysus
in thread Delegating to a role in Moose by nysus

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.