MooseX::Clone(3) User Contributed Perl Documentation MooseX::Clone(3)NAMEMooseX::Clone - Fine grained cloning support for Moose objects.
SYNOPSIS
package Bar;
use Moose;
with qw(MooseX::Clone);
has foo => (
isa => "Foo",
traits => [qw(Clone)], # this attribute will be recursively cloned
);
package Foo;
use Moose;
# this API is used/provided by MooseX::Clone
sub clone {
my ( $self, %params ) = @_;
# ...
}
# used like this:
my $bar = Bar->new( foo => Foo->new );
my $copy = $bar->clone( foo => [ qw(Args for Foo::clone) ] );
DESCRIPTION
Out of the box Moose only provides very barebones cloning support in
order to maximize flexibility.
This role provides a "clone" method that makes use of the low level
cloning support already in Moose and adds selective deep cloning based
on introspection on top of that. Attributes with the "Clone" trait will
handle cloning of data within the object, typically delegating to the
attribute value's own "clone" method.
TRAITS
Clone
By default Moose objects are cloned like this:
bless { %$old }, ref $old;
By specifying the Clone trait for certain attributes custom
behavior the value's own "clone" method will be invoked.
By extending this trait you can create custom cloning for certain
attributes.
By creating "clone" methods for your objects (e.g. by composing
MooseX::Compile) you can make them interact with this trait.
NoClone
Specifies attributes that should be skipped entirely while cloning.
METHODS
clone %params
Returns a clone of the object.
All attributes which do the
MooseX::Clone::Meta::Attribute::Trait::Clone role will handle
cloning of that attribute. All other fields are plainly copied
over, just like in "clone_object" in Class::MOP::Class.
Attributes whose "init_arg" is in %params and who do the "Clone"
trait will get that argument passed to the "clone" method
(dereferenced). If the attribute does not self-clone then the param
is used normally by "clone_object" in Class::MOP::Class, that is it
will simply shadow the previous value, and does not have to be an
array or hash reference.
TODO
Refactor to work in term of a metaclass trait so that
"meta->clone_object" will still do the right thing.
THANKS
clkao made the food required to write this module
VERSION CONTROL
<http://code2.0beta.co.uk/moose/svn/>. Ask on #moose for commit bits.
AUTHOR
Yuval Kogman <nothingmuch@woobling.org>
COPYRIGHT
Copyright (c) 2008 Yuval Kogman. All rights reserved
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
perl v5.14.1 2010-01-13 MooseX::Clone(3)
