CLONE - reference manual online

Recursively copy Perl datatypes.

Clone(3pm)                     User Contributed Perl Documentation                     Clone(3pm)

NAME Clone - recursively copy Perl datatypes
SYNOPSIS 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;
DESCRIPTION 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) };
SEE ALSO 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.
AUTHOR Ray Finch "<>" Breno G. de Oliveira "<>" and Florian Ragwitz "<>" perform routine maintenance releases since 2012.
perl v5.22.1 2015-12-18 Clone(3pm)