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Moose::Cookbook::SnackUserpContributed Perl DoMoose::Cookbook::Snack::Types(3)

NAME
       Moose::Cookbook::Snack::Types - Snippets	of code	for using Types	and
       Type Constraints

VERSION
       version 2.2013

SYNOPSIS
	 package Point;
	 use Moose;

	 has 'x' => ( isa => 'Int', is => 'ro' );
	 has 'y' => ( isa => 'Int', is => 'rw' );

	 package main;
	 use Try::Tiny;

	 my $point = try {
	     Point->new( x => 'fifty', y => 'forty' );
	 }
	 catch {
	     print "Oops: $_";
	 };

	 my $point;
	 my $xval	      =	'forty-two';
	 my $xattribute	      =	Point->meta->find_attribute_by_name('x');
	 my $xtype_constraint =	$xattribute->type_constraint;

	 if ( $xtype_constraint->check($xval) )	{
	     $point = Point->new( x => $xval, y	=> 0 );
	 }
	 else {
	     print "Value: $xval is not	an " . $xtype_constraint->name . "\n";
	 }

DESCRIPTION
       This is the Point example from
       Moose::Cookbook::Basics::Point_AttributesAndSubclassing with type
       checking	added.

       If we try to assign a string value to an	attribute that is an "Int",
       Moose will die with an explicit error message. The error	will include
       the attribute name, as well as the type constraint name and the value
       which failed the	constraint check.

       We use Try::Tiny	to catch this error message.

       Later, we get the Moose::Meta::TypeConstraint object from a
       Moose::Meta::Attribute and use the Moose::Meta::TypeConstraint to check
       a value directly.

SEE ALSO
       Moose::Cookbook::Basics::Point_AttributesAndSubclassing
       Moose::Util::TypeConstraints
       Moose::Meta::Attribute

AUTHORS
       o   Stevan Little <stevan.little@iinteractive.com>

       o   Dave	Rolsky <autarch@urth.org>

       o   Jesse Luehrs	<doy@tozt.net>

       o   Shawn M Moore <code@sartak.org>

       o   xxxx	x<section>xx'xx	(Yuval Kogman) <nothingmuch@woobling.org>

       o   Karen Etheridge <ether@cpan.org>

       o   Florian Ragwitz <rafl@debian.org>

       o   Hans	Dieter Pearcey <hdp@weftsoar.net>

       o   Chris Prather <chris@prather.org>

       o   Matt	S Trout	<mst@shadowcat.co.uk>

COPYRIGHT AND LICENSE
       This software is	copyright (c) 2006 by Infinity Interactive, Inc.

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

perl v5.32.0			  2020-07-21  Moose::Cookbook::Snack::Types(3)

NAME | VERSION | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS | COPYRIGHT AND LICENSE

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