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moose::cookbook::snack::types(3) [osx man page]

Moose::Cookbook::Snack::Types(3)			User Contributed Perl Documentation			  Moose::Cookbook::Snack::Types(3)

NAME
Moose::Cookbook::Snack::Types - Snippets of code for using Types and Type Constraints VERSION
version 2.0604 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 . " "; } 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::Utils::TypeConstraints Moose::Meta::Attribute AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for details. COPYRIGHT AND LICENSE
This software is copyright (c) 2012 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 v5.16.2 2012-09-19 Moose::Cookbook::Snack::Types(3)

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Moose::Meta::TypeConstraint::Parameterizable(3) 	User Contributed Perl Documentation	   Moose::Meta::TypeConstraint::Parameterizable(3)

NAME
Moose::Meta::TypeConstraint::Parameterizable - Type constraints which can take a parameter (ArrayRef) VERSION
version 2.0604 DESCRIPTION
This class represents a parameterizable type constraint. This is a type constraint like "ArrayRef" or "HashRef", that can be parameterized and made more specific by specifying a contained type. For example, instead of just an "ArrayRef" of anything, you can specify that is an "ArrayRef[Int]". A parameterizable constraint should not be used as an attribute type constraint. Instead, when parameterized it creates a Moose::Meta::TypeConstraint::Parameterized which should be used. INHERITANCE
"Moose::Meta::TypeConstraint::Parameterizable" is a subclass of Moose::Meta::TypeConstraint. METHODS
This class is intentionally not documented because the API is confusing and needs some work. BUGS
See "BUGS" in Moose for details on reporting bugs. AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for details. COPYRIGHT AND LICENSE
This software is copyright (c) 2012 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 v5.16.2 2012-09-19 Moose::Meta::TypeConstraint::Parameterizable(3)
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