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) };
Storable’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 2001−2022 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 "<[email protected]>"
Breno G. de Oliveira "<[email protected]>", Nicolas Rochelemagne "<[email protected]>" and Florian Ragwitz "<[email protected]>" perform routine maintenance releases since 2012.