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MooseX::LazyRequire.3pm
Langue: en
Version: 2010-07-19 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
NAME
MooseX::LazyRequire - Required attributes which fail only when trying to use themSYNOPSIS
package Foo; use Moose; use MooseX::LazyRequire; has foo => ( is => 'ro', lazy_required => 1, ); has bar => ( is => 'ro', builder => '_build_bar', ); sub _build_bar { shift->foo } Foo->new(foo => 42); # succeeds, foo and bar will be 42 Foo->new(bar => 42); # succeeds, bar will be 42 Foo->new; # fails, neither foo nor bare were given
DESCRIPTION
This module adds a "lazy_required" option to Moose attribute declarations.The reader methods for all attributes with that option will throw an exception unless a value for the attributes was provided earlier by a constructor parameter or through a writer method.
CAVEATS
Apparently Moose roles don't have an attribute metaclass, so this module can't easily apply its magic to attributes defined in roles. If you want to use "lazy_required" in role attributes, you'll have to apply the attribute trait yourself:has foo => ( traits => ['LazyRequire'], is => 'ro', lazy_required => 1, );
AUTHOR
Florian Ragwitz <rafl@debian.org>COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by Florian Ragwitz.This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre