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    <title>Moo - Tag - blog::weyl.io</title>
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    <webMaster>chris@weyl.io (Chris Weyl)</webMaster>
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      <title>MX::AttributeShortcuts -- now with Moo-style type constraints</title>
      <link>https://weyl.io/2015/04/mxas-and-moo-constraints/</link>
      <pubDate>Wed, 08 Apr 2015 00:00:00 +0000</pubDate><author>chris@weyl.io (Chris Weyl)</author>
      <guid>https://weyl.io/2015/04/mxas-and-moo-constraints/</guid>
      <category domain="https://weyl.io/categories/perl/">Perl</category>
      <description>&lt;p&gt;I just released &lt;a href=&#34;https://metacpan.org/pod/MooseX::AttributeShortcuts&#34; target=&#34;_blank&#34; rel=&#34;external nofollow noopener noreferrer&#34;&gt;MooseX::AttributeShortcuts&lt;i class=&#34;fa-solid fa-external-link-alt fa-fw fa-xs ms-1 text-secondary&#34; aria-hidden=&#34;true&#34;&gt;&lt;/i&gt;&lt;/a&gt;&#xA;0.028; it incorporates &lt;a href=&#34;https://metacpan.org/pod/Moo&#34; target=&#34;_blank&#34; rel=&#34;external nofollow noopener noreferrer&#34;&gt;Moo&lt;i class=&#34;fa-solid fa-external-link-alt fa-fw fa-xs ms-1 text-secondary&#34; aria-hidden=&#34;true&#34;&gt;&lt;/i&gt;&lt;/a&gt;-style type constraints.&lt;/p&gt;&#xA;&lt;p&gt;&amp;hellip;largely because I needed to relax, and wrote&#xA;&lt;a href=&#34;https://metacpan.org/pod/MooseX::Meta::TypeConstraint::Mooish&#34; target=&#34;_blank&#34; rel=&#34;external nofollow noopener noreferrer&#34;&gt;MooseX::Meta::TypeConstraint::Mooish&lt;i class=&#34;fa-solid fa-external-link-alt fa-fw fa-xs ms-1 text-secondary&#34; aria-hidden=&#34;true&#34;&gt;&lt;/i&gt;&lt;/a&gt; :)&lt;/p&gt;&#xA;&lt;p&gt;That means you can now pass a coderef to has() in isa that, like with Moo,&#xA;dies on validation failure and lives on validation success:&lt;/p&gt;&#xA;&lt;!-- &lt;script src=&#34;https://gist.github.com/rsrchboy/2e2216c9a16fa06b345b.js&#34;&gt;&lt;/script&gt; --&gt;&#xA;&lt;pre&gt;&lt;code&gt;# easiest is via AttributeShortcuts&#xA;use MooseX::AttributeShortcuts 0.028;&#xA;&#xA;has foo =&amp;gt; (&#xA;  is =&amp;gt; &amp;#39;rw&amp;#39;,&#xA;  # $_[0] == the value to be validated&#xA;  isa =&amp;gt; sub { die unless $_[0] == 5 },&#xA;);&lt;/code&gt;&lt;/pre&gt;</description>
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