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How do you clone a data structure?

by szabgab (Priest)
on Mar 28, 2012 at 09:26 UTC ( #962124=perlquestion: print w/ replies, xml ) Need Help??
szabgab has asked for the wisdom of the Perl Monks concerning the following question:

If there is a datastructure which is more than one level deep, I usually use dclone of Storable. I wonder what do you use and why do you think it is better than the dclone of Storable?

Comment on How do you clone a data structure?
Re: How do you clone a data structure?
by BrowserUk (Pope) on Mar 28, 2012 at 09:45 UTC

    Clone::clone() if I need performance; because it was faster than Storable when I tried it a few years ago. That may have changed; YMMV.

    Though often as not when I need to clone something, I'll use a custom clone() for the purpose, that only deals with the cases I need to deal with. For example:

    sub clone { my $ref = shift; ref( $ref ) or return $ref; ref( $ref ) eq 'SCALAR' and return \$$ref; ref( $ref ) eq 'HASH' and return { map+( $_, clone( $ref->{$_} ) +), keys %{ $ref } }; ref( $ref ) eq 'ARRAY' and return [ map clone( $ref->[$_] ), 0 .. + $#{ $ref } ]; }

    That deals with most 'normal' data-structures that don't contain 'exotics' -- bless refs or coderefs and the like.


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Re: How do you clone a data structure?
by repellent (Priest) on Mar 30, 2012 at 08:25 UTC

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