NAME MooseX::Types::Ro - Moose type constraints for read-only containers SYNOPSIS package Foo; use Moose; use MooseX::Types::Ro qw(RoArrayRef RoHashRef); has array => ( is => 'ro', isa => RoArrayRef, coerce => 1 ); has hash => ( is => 'ro', isa => RoHashRef, coerce => 1 ); my $foo = Foo->new(array => [1, 2, 3], hash => { foo => 1, bar => 2 }); # These all throw exceptions now: $foo->array->[0] = 42; $foo->array->[3] = 42; push @{$foo->array}, 69; $foo->hash->{bar} = 3; delete $foo->hash->{bar};p $foo->hash->{baz} = 4; DESCRIPTION MooseX::Types::Ro provides Moose type constraints for read-only array and hash references. Attempting to modify the values in any way, including adding or deleting from the arrays and hashes will throw an exception. TYPES RoArrayRef A subtype of "ArrayRef" in which the array itself and all the elements are read-only. Coerces from "ArrayRef" by making a shallow copy and marking it read-only. RoHashRef A subtype of "HashRef" in which the hash itself and all the values are read-only. Coerces from HashRef by making a shallow copy and marking it read-only. SEE ALSO MooseX::Types, MooseX::Types::Moose, Moose::Util::TypeConstraints, Internals AUTHOR Dagfinn Ilmari Mannsåker . COPYRIGHT & LICENSE Copyright (c) 2010 Dagfinn Ilmari Mannsåker . This program is free software; you can redistribute and/or modify it under the same terms as perl itself.