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Clone - recursively copy Perl datatypes |
Clone - recursively copy Perl datatypes
use Clone 'clone';
my $data = {
set => [ 1 .. 50 ],
foo => {
answer => 42,
object => SomeObject->new,
},
};
my $cloned_data = clone($data);
$cloned_data->{foo}{answer} = 1;
print $cloned_data->{foo}{answer}; # '1'
print $data->{foo}{answer}; # '42'
You can also add it to your class:
package Foo;
use parent 'Clone';
sub new { bless {}, shift }
package main;
my $obj = Foo->new;
my $copy = $obj->clone;
This module provides a clone() method which makes recursive
copies of nested hash, array, scalar and reference types,
including tied variables and objects.
clone() takes a scalar argument and duplicates it. To duplicate lists,
arrays or hashes, pass them in by reference, e.g.
my $copy = clone (\@array);
# or
my %copy = %{ clone (\%hash) };
the Storable manpage's dclone() is a flexible solution for cloning variables,
albeit slower for average-sized data structures. Simple
and naive benchmarks show that Clone is faster for data structures
with 3 or fewer levels, while dclone() can be faster for structures
4 or more levels deep.
Copyright 2001-2015 Ray Finch. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Ray Finch <rdf@cpan.org>
Breno G. de Oliveira <garu@cpan.org> and
Florian Ragwitz <rafl@debian.org> perform routine maintenance
releases since 2012.
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Clone - recursively copy Perl datatypes |