Clone::Choose(3p)

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" 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>. 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>

•   AnnoCPAN: Annotated CPAN documentation

    <http://annocpan.org/dist/Clone-Choose>

•   CPAN Ratings

    <http://cpanratings.perl.org/d/Clone-Choose>

•   Search CPAN

    <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, Clone::PP, Storable