# NAME
Clone::Choose - Choose appropriate clone utility
# SYNOPSIS
use Clone::Choose;
my $data = {
value => 42,
href => {
set => [ 'foo', 'bar' ],
value => 'baz',
},
};
my $cloned_data = clone $data;
# it's also possible to use Clone::Choose and pass a clone preference
use Clone::Choose qw(:Storable);
# DESCRIPTION
`Clone::Choose` checks several different modules which provides a
`clone()` function and selects an appropriate one. The default preference
is
Clone
Storable
Clone::PP
This list might evolve in future. Please see ["EXPORTS"](#exports) how to pick a
particular one.
# EXPORTS
`Clone::Choose` exports `clone()` by default.
One can explicitly import `clone` by using
use Clone::Choose qw(clone);
or pick a particular `clone` implementation
use Clone::Choose qw(:Storable clone);
The exported implementation is resolved dynamically, which means that any
using module can either rely on the default backend preference or choose
a particular one.
It is also possible to select a particular `clone` backend by setting the
environment variable CLONE\_CHOOSE\_PREFERRED\_BACKEND to your preferred backend.
This also means, an already chosen import can't be modified like
use Clone::Choose qw(clone :Storable);
When one seriously needs different clone implementations, our _recommended_
way to use them would be:
use Clone::Choose (); # do not import
my ($xs_clone, $st_clone);
{ local @Clone::Choose::BACKENDS = (Clone => "clone"); $xs_clone = Clone::Choose->can("clone"); }
{ local @Clone::Choose::BACKENDS = (Storable => "dclone"); $st_clone = Clone::Choose->can("clone"); }
Don't misinterpret _recommended_ - modifying `@Clone::Choose::BACKENDS`
has a lot of pitfalls and is unreliable beside such small examples. Do
not hesitate open a request with an appropriate proposal for choosing
implementations dynamically.
The use of `@Clone::Choose::BACKENDS` is discouraged and will be deprecated
as soon as anyone provides a better idea.
# PACKAGE METHODS
## backend
`backend` tells the caller about the dynamic chosen backend:
use Clone::Choose;
say Clone::Choose->backend; # Clone
This method currently exists for debug purposes only.
## get\_backends
`get_backends` returns a list of the currently supported backends.
# AUTHOR
Jens Rehsack <rehsack at cpan dot org>
Stefan Hermes <hermes at cpan dot org>
# BUGS
Please report any bugs or feature requests to
`bug-Clone-Choose at rt.cpan.org`, or through the web interface at
[http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Clone-Choose](http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Clone-Choose).
I will be notified, and then you'll automatically be notified of progress
on your bug as I make changes.
# SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Clone::Choose
You can also look for information at:
- RT: CPAN's request tracker
[http://rt.cpan.org/NoAuth/Bugs.html?Dist=Clone-Choose](http://rt.cpan.org/NoAuth/Bugs.html?Dist=Clone-Choose)
- AnnoCPAN: Annotated CPAN documentation
[http://annocpan.org/dist/Clone-Choose](http://annocpan.org/dist/Clone-Choose)
- CPAN Ratings
[http://cpanratings.perl.org/d/Clone-Choose](http://cpanratings.perl.org/d/Clone-Choose)
- Search CPAN
[http://search.cpan.org/dist/Clone-Choose/](http://search.cpan.org/dist/Clone-Choose/)
# LICENSE AND COPYRIGHT
Copyright 2017 Jens Rehsack
Copyright 2017 Stefan Hermes
This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.
# SEE ALSO
[Clone](https://metacpan.org/pod/Clone), [Clone::PP](https://metacpan.org/pod/Clone::PP), [Storable](https://metacpan.org/pod/Storable)