Name¶

Mo - Micro Objects. Mo is less.

Synopsis¶

    package Less;
    use Mo;
    extends 'Nothing';
    has something => ();

Description¶

use Mo. Mo is less. Much less.

Moose is huge. Moose led to Mouse led to Moo led to Mo. M is nothing. Mo is more. Not much.

When Moo is more than you need, drop an 'o' and get some Mo.

To get just a little Mo from Mo, use "Mo Features" below.

Core Features¶

This is what you get. Nothing Mo.

"new" method

Mo provides a "new" object constructor. You pass it a list of name/value pairs and it returns a new object.

Constructor will not call BUILD methods. This is available using the Mo::build feature.

"extends"

Mo exports the "extends" keyword, to declare your parent class. "Mo::Object" itself is your default parent class.

Mo only supports single inheritance. If you need multiple inheritance or roles, you should upgrade to Moo.

"has"

Mo exports a "has" keyword, to generate accessors.

These accessors always support both "get" and "set" operations. That's it.

    has name => ();
    has thing => (foo => 'bar');  # arguments silently ignored
    

All arguments passed to "has" are ignored. This makes it easier to switch between Mo and Moo, without having to change all your accessors.

"strict" and "warnings"

Mo turns on "use strict" and "use warnings" for you.

Embeddable

Mo is tiny. It is compressed into a single line. You can easily inline it in your code, should you want to do that. See Mo::Inline for more information, including a utility that will do it for you.

Mo Features¶

Mo is the bare minimum needed for Perl OO. Many times you'll want just a couple more features. Don't worry. Mo's got you covered:

    use Mo qw'build default builder coerce is required';
    has name1 => ( default => sub { 'Joe' } );
    has name2 => ( builder => 'name_builder' );
    has name3 => ( coerce => sub {$_[0]} );
    has name4 => ( is => 'ro' );
    has name4 => ( required => 1 );
    sub BUILD {
        my $self = shift;
        ...
    }

Mo simply loads the feature classes Mo::build, Mo::default, Mo::builder, Mo::coerce, Mo::is and Mo::required. The first one supports BUILD constructing and the other three add their magics to "has". A Mo::Feature module can enhance "new", "extends" and "has", and also add new export subs, or remove existing ones. Features can also be combined for a single accessor. See Mo::Features for a list of all the features and for an explanation of the Feature API..

See¶

Mo::Features

Mo::Inlining

Mo::Hacking

Mo::Design

Status¶

Authors¶

Ingy döt Net <ingy@cpan.org>

Damien 'dams' Krotkine <dams@cpan.org>

Matt S. Trout (mst) <mst@shadowcat.co.uk>

Christian Walde <walde.christian@googlemail.com>

Alessandro Ranellucci (aar/alexrj) <aar@cpan.org>

Carlos Lima (priodev) <carlos@cpan.org>

Copyright and License¶

Copyright (c) 2011-2013. Ingy döt Net.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See http://www.perl.com/perl/misc/Artistic.html