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Toby Inkster

NAME

Monjon - create your Moo objects as blessed scalar refs

SYNOPSIS

        use v5.14;
        
        package MyClass {
                use Monjon;
                has id   => (is => 'ro', pack => 'L');
                has name => (is => 'rw', pack => 'Z32');
        }
        
        my $obj = MyClass->new(id => 42, name => "The Answer");

DESCRIPTION

Monjon is a subclass of Moo designed for efficient memory usage when you need to deal with many thousands of very simple objects.

Attributes are stored using a variation on the pack/unpack technique used by BrowserUK on PerlMonks at http://www.perlmonks.org/?node_id=1040313.

However, inside-out attributes are also offered for data which cannot be reasonably serialized to a string. (But if you do need to store things like references, perhaps Monjon is not for you.)

Differences from Moo

has

The attribute spec accepts an additional option pack. The presence of this key in the specification makes your attribute be stored in the object's packed string. Attributes without a pack option will be stored inside-out.

extends

Extending non-Monjon classes is not supported. (But who knows? It could work!)

before, after, and around

Monjon is sometimes forced to rebuild constructors and accessors at run-time, which may lead to method modifiers being overwritten, if you have tried to apply any modifiers to them.

Basically, don't apply method modifiers to accessors.

Benchmarking

Monjon's accessors are significantly slower than Moo's, especially when Moo is able to make use of Class::XSAccessor.

However, if your data consists of mostly numbers, booleans, and small or fixed-width strings, Monjon is likely to consume a lot less memory per instance.

See: https://github.com/tobyink/p5-monjon/blob/master/devel.bench/bench.pl.

What's a Monjon?

It's a very shy little wallaby, and it's near-threatened. See http://en.wikipedia.org/wiki/Monjon.

If you like this module and want to help monjons, please see http://www.australianwildlife.org.au/Artesian-Range.aspx.

CAVEATS

Unless you have Moo 1.004_003 exactly (i.e. neither an older nor a newer version of Moo), multiple inheritance is unlikely to work for Monjon classes.

BUGS

Please report any bugs to http://rt.cpan.org/Dist/Display.html?Queue=Monjon.

SEE ALSO

Moo.

http://www.perlmonks.org/?node_id=1040313.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2014 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.