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Re: Nowadays, there are several good choices on CPAN for using roles

by tobyink (Abbot)
on Jan 04, 2013 at 09:30 UTC ( #1011583=note: print w/replies, xml ) Need Help??


in reply to Nowadays, there are several good choices on CPAN for using roles

There is Role::Basic which was partly written in response to perceived weaknesses in Role::Tiny that have since been addressed. It has some other differences, but I (personally) don't see any reason to use Role::Basic in 2013.

And there is Moo::Role which is a wrapper for Role::Tiny (in fact, Role::Tiny was originally part of Moo, but was spun off as a separate distribution) but also gives you a fairly Moose-like has keyword, and offers integration with Moose so that Moose classes can consume Moo roles and Moo classes can consume Moose roles seamlessly.

My personal view is: if you need advanced meta-hackery or need to use some MooseX modules, then use Moose. Otherwise, use Moo because that will magically upgrade itself to Moose when you need it.

Steer away from Mouse. Although still actively developed, its original author seems to pretty much share my view above. See for example the documentation from recent releases of Any::Moose.

Also worth a mention, MooseX::Role::Parameterized which allows you to create a "template" role. Classes then specify a hashref of parameters to create a variant of the role which they then consume. An example might be a "Serializable" role; classes can then specify:

use Moose; with 'Serializable' => { format => 'JSON' };
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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[Corion]: Meh. Some Open Source people get bought out by advertising firms to change their projects to include advertising. But nobody has approached me to buy out WWW::Mechanize ::$browser from me, to make the browsers launch an ad page ...
[Corion]: ... instead of about:blank, which the modules currently do at startup.
[Corion]: Maybe I'm too pricey. But I haven't received any offers at all ;-)
[Corion]: The ad hits from CPAN testers alone should bring in a pretty penny IMO. But maybe I misestimate the CPC that ads pay.

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