jkeenan / clone-pp Goto Github PK
View Code? Open in Web Editor NEWThis project forked from neilb/clone-pp
Release history of Clone-PP
Home Page: http://search.cpan.org/dist/Clone-PP/
This project forked from neilb/clone-pp
Release history of Clone-PP
Home Page: http://search.cpan.org/dist/Clone-PP/
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 <Storable/dclone>. 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.
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.