Function::Fallback::CoreOrPP - Functions that use non-core XS module but provide pure-Perl/core fallback


This document describes version 0.07 of Function::Fallback::CoreOrPP (from Perl distribution Function-Fallback-CoreOrPP), released on 2016-01-16.


 use Function::Fallback::CoreOrPP qw(clone unbless uniq);

 my $clone = clone({blah=>1});
 my $unblessed = unbless($blessed_ref);
 my @uniq  = uniq(1, 3, 2, 1, 4);  # -> (1, 3, 2, 4)


This module provides functions that use non-core XS modules (for best speed, reliability, feature, etc) but falls back to those that use core XS or pure-Perl modules when the non-core XS module is not available.

This module helps when you want to bootstrap your Perl application with a portable, dependency-free Perl script. In a vanilla Perl installation (having only core modules), you can use App::FatPacker to include non-core pure-Perl dependencies to your script.


clone($data) => $cloned

Try to use Data::Clone's clone, but fall back to using Clone::PP's clone.

clone_list(@data) => @data

A shortcut for:

 return map {clone($_)} @data

unbless($ref) => $unblessed_ref

Try to use Acme::Damn's damn to unbless a reference but fall back to shallow copying.

NOTE: damn() MODIFIES the original reference. (XXX in the future an option to clone the reference first will be provided), while shallow copying will return a shallow copy.

NOTE: The shallow copy method currently only handles blessed {scalar,array,hash}ref as those are the most common.

uniq(@ary) => @uniq_ary

Try to use List::MoreUtils's uniq, but fall back to using slower, pure-Perl implementation.


Clone::Any can also uses multiple backends, but I avoid it because I don't think Storable's dclone should be used (no Regexp support out of the box + must use deparse to handle coderefs).


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Source repository is at


Please report any bugs or feature requests on the bugtracker website

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.


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This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.