https://github.com/neilb/clone-pp

Release history of Clone-PP
https://github.com/neilb/clone-pp

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Release history of Clone-PP

• Host: GitHub
• URL: https://github.com/neilb/clone-pp
• Owner: neilb
• Created: 2014-02-15T10:08:54.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2020-10-20T10:51:15.000Z (about 4 years ago)
• Last Synced: 2024-10-11T21:08:51.044Z (2 months ago)
• Language: Perl
• Homepage: http://search.cpan.org/dist/Clone-PP/
• Size: 28.3 KB
• Stars: 1
• Watchers: 3
• Forks: 3
• Open Issues: 2
• Metadata Files:
  • Readme: README
  • Changelog: Changes

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README

        
NAME

    Clone::PP - Recursively copy Perl datatypes

SYNOPSIS

      use Clone::PP qw(clone);

  

      $item = { 'foo' => 'bar', 'move' => [ 'zig', 'zag' ]  };

      $copy = clone( $item );

      $item = [ 'alpha', 'beta', { 'gamma' => 'vlissides' } ];

      $copy = clone( $item );

      $item = Foo->new();

      $copy = clone( $item );

    Or as an object method:

      require Clone::PP;

      push @Foo::ISA, 'Clone::PP';

  

      $item = Foo->new();

      $copy = $item->clone();

DESCRIPTION

    This module provides a general-purpose clone function to make deep

    copies of Perl data structures. It calls itself recursively to copy

    nested hash, array, scalar and reference types, including tied variables

    and objects.

    The clone() function takes a scalar argument to copy. To duplicate

    arrays or hashes, pass them in by reference:

      my $copy = clone(\@array);    my @copy = @{ clone(\@array) };

      my $copy = clone(\%hash);     my %copy = %{ clone(\%hash) };

    The clone() function also accepts an optional second parameter that can

    be used to limit the depth of the copy. If you pass a limit of 0, clone

    will return the same value you supplied; for a limit of 1, a shallow

    copy is constructed; for a limit of 2, two layers of copying are done,

    and so on.

      my $shallow_copy = clone( $item, 1 );

    To allow objects to intervene in the way they are copied, the clone()

    function checks for a couple of optional methods. If an object provides

    a method named "clone_self", it is called and the result returned

    without further processing. Alternately, if an object provides a method

    named "clone_init", it is called on the copied object before it is

    returned.

BUGS

    Some data types, such as globs, regexes, and code refs, are always

    copied shallowly.

    References to hash elements are not properly duplicated. (This is why

    two tests in t/dclone.t that are marked "todo".) For example, the

    following test should succeed but does not:

      my $hash = { foo => 1 }; 

      $hash->{bar} = \{ $hash->{foo} }; 

      my $copy = clone( \%hash ); 

      $hash->{foo} = 2; 

      $copy->{foo} = 2; 

      ok( $hash->{bar} == $copy->{bar} );

    To report bugs via the CPAN web tracking system, go to

    "http://rt.cpan.org/NoAuth/Bugs.html?Dist=Clone-PP" or send mail to

    "Dist=Clone-PP#rt.cpan.org", replacing "#" with "@".

SEE ALSO

    For a faster implementation in XS, see the clone entry in the Clone

    manpage, the clone entry in the Util manpage, or .

CREDITS AND COPYRIGHT

    Developed by Matthew Simon Cavalletto at Evolution Softworks. More free

    Perl software is available at "www.evoscript.org".

    Copyright 2003 Matthew Simon Cavalletto. You may contact the author

    directly at "[email protected]" or "[email protected]".

    Code initially derived from Ref.pm. Portions Copyright 1994 David Muir

    Sharnoff.

    Interface based by Clone by Ray Finch with contributions from

    chocolateboy. Portions Copyright 2001 Ray Finch. Portions Copyright 2001

    chocolateboy.

    You may use, modify, and distribute this software under the same terms

    as Perl.