Moose::Cookbook::Snack::Types(3pm) - phpMan

Moose::Cookbook::Snack::Types(3User Contributed Perl DocumentatMoose::Cookbook::Snack::Types(3pm)



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

SYNOPSIS
         package Point;
         use Moose;

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

         package main;

         my $point = eval { Point->new( x => 'fifty', y => 'forty' ); };

         if ($@) {
             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::Recipe1 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 "eval" to catch this error message in $@.

       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::Recipe1
       Moose::Utils::TypeConstraints
       Moose::Meta::Attribute

AUTHOR
       Jess Robinson <cpan AT desert-island.uk>

COPYRIGHT AND LICENSE
       Copyright 2006-2009 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

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



perl v5.10.0                                2009-03-14         Moose::Cookbook::Snack::Types(3pm)

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