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package Moose::Meta::Attribute::Native::Trait::Hash; our $VERSION = '2.2203'; use Moose::Role; with 'Moose::Meta::Attribute::Native::Trait'; sub _helper_type { 'HashRef' } no Moose::Role; 1; # ABSTRACT: Helper trait for HashRef attributes __END__ =pod =encoding UTF-8 =head1 NAME Moose::Meta::Attribute::Native::Trait::Hash - Helper trait for HashRef attributes =head1 VERSION version 2.2203 =head1 SYNOPSIS package Stuff; use Moose; has 'options' => ( traits => ['Hash'], is => 'ro', isa => 'HashRef[Str]', default => sub { {} }, handles => { set_option => 'set', get_option => 'get', has_no_options => 'is_empty', num_options => 'count', delete_option => 'delete', option_pairs => 'kv', }, ); =head1 DESCRIPTION This trait provides native delegation methods for hash references. =head1 PROVIDED METHODS =head2 get($key, $key2, $key3...) Returns values from the hash. In list context it returns a list of values in the hash for the given keys. In scalar context it returns the value for the last key specified. This method requires at least one argument. =head2 set($key =E<gt> $value, $key2 =E<gt> $value2...) Sets the elements in the hash to the given values. It returns the new values set for each key, in the same order as the keys passed to the method. This method requires at least two arguments, and expects an even number of arguments. =head2 delete($key, $key2, $key3...) Removes the elements with the given keys. In list context it returns a list of values in the hash for the deleted keys. In scalar context it returns the value for the last key specified. =head2 keys Returns the list of keys in the hash. This method does not accept any arguments. =head2 exists($key) Returns true if the given key is present in the hash. This method requires a single argument. =head2 defined($key) Returns true if the value of a given key is defined. This method requires a single argument. =head2 values Returns the list of values in the hash. This method does not accept any arguments. =head2 kv Returns the key/value pairs in the hash as an array of array references. for my $pair ( $object->option_pairs ) { print "$pair->[0] = $pair->[1]\n"; } This method does not accept any arguments. =head2 elements In list context, this returns the key/value pairs in the hash. In scalar context, this returns the count of keys plus values. In other words, it's the same as L<keys> times two. This method does not accept any arguments. =head2 clear Resets the hash to an empty value, like C<%hash = ()>. This method does not accept any arguments. =head2 count Returns the number of elements in the hash. Also useful to check for a nonempty hash, because C<count> returns a true (nonzero) value if there is something in the hash: C<< has_options => 'count' >>. This method does not accept any arguments. =head2 is_empty If the hash is populated, returns false. Otherwise, returns true. This method does not accept any arguments. =head2 accessor($key) =head2 accessor($key, $value) If passed one argument, returns the value of the specified key. If passed two arguments, sets the value of the specified key. When called as a setter, this method returns the value that was set. =head2 shallow_clone This method returns a shallow clone of the hash reference. The return value is a reference to a new hash with the same keys and values. It is I<shallow> because any values that were references in the original will be the I<same> references in the clone. =head2 Why no C<each>? We have deliberately omitted a method for C<each>, due to its stateful interaction with the hash iterator. Using C<keys> or C<kv> is much safer. =head2 Moose::Meta::Attribute->meta This will return a L<Class::MOP::Class> instance for this class. It should also be noted that L<Class::MOP> will actually bootstrap this module by installing a number of attribute meta-objects into its metaclass. =head1 BUGS See L<Moose/BUGS> for details on reporting bugs. =head1 AUTHORS =over 4 =item * Stevan Little <stevan@cpan.org> =item * Dave Rolsky <autarch@urth.org> =item * Jesse Luehrs <doy@cpan.org> =item * Shawn M Moore <sartak@cpan.org> =item * יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org> =item * Karen Etheridge <ether@cpan.org> =item * Florian Ragwitz <rafl@debian.org> =item * Hans Dieter Pearcey <hdp@cpan.org> =item * Chris Prather <chris@prather.org> =item * Matt S Trout <mstrout@cpan.org> =back =head1 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. =cut