Hash::Merge::Simple(3)User Contributed Perl DocumentatioHash::Merge::Simple(3)NAMEHash::Merge::Simple - Recursively merge two or more hashes, simply
VERSION
Version 0.04
SYNOPSIS
use Hash::Merge::Simple qw/merge/;
my $a = { a => 1 };
my $b = { a => 100, b => 2};
# Merge with righthand hash taking precedence
my $c = merge $a, $b;
# $c is { a => 100, b => 2 } ... Note: a => 100 has overridden => 1
# Also, merge will take care to recursively merge any subordinate hashes found
my $a = { a => 1, c => 3, d => { i => 2 }, r => {} };
my $b = { b => 2, a => 100, d => { l => 4 } };
my $c = merge $a, $b;
# $c is { a => 100, b => 2, c => 3, d => { i => 2, l => 4 }, r => {} }
# You can also merge more than two hashes at the same time
# The precedence increases from left to right (the rightmost has the most precedence)
my $everything = merge $this, $that, $mine, $yours, $kitchen_sink, ...;
DESCRIPTIONHash::Merge::Simple will recursively merge two or more hashes and
return the result as a new hash reference. The merge function will
descend and merge hashes that exist under the same node in both the
left and right hash, but doesn't attempt to combine arrays, objects,
scalars, or anything else. The rightmost hash also takes precedence,
replacing whatever was in the left hash if a conflict occurs.
This code was pretty much taken straight from Catalyst::Utils, and
modified to handle more than 2 hashes at the same time.
EXPORTS
merge
See below.
METHODS
Hash::Merge::Simple->merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
Hash::Merge::Simple::merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
Merge <hash1> through <hashN>, with the nth-most (rightmost) hash
taking precedence.
Returns a new hash reference representing the merge.
NOTE: The code does not currently check for cycles, so infinite loops
are possible:
my $a = {};
$a->{b} = $a;
merge $a, $a;
NOTE: If you want to avoid giving/receiving side effects with the
merged result, use "clone_merge" or "dclone_merge" An example of this
problem (thanks Uri):
my $left = { a => { b => 2 } } ;
my $right = { c => 4 } ;
my $result = merge( $left, $right ) ;
$left->{a}{b} = 3 ;
$left->{a}{d} = 5 ;
# $result->{a}{b} == 3 !
# $result->{a}{d} == 5 !
Hash::Merge::Simple->clone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
Hash::Merge::Simple::clone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
Perform a merge, clone the merge, and return the result
This is useful in cases where you need to ensure that the result can be
tweaked without fear of giving/receiving any side effects
This method will use Clone to do the cloning
Hash::Merge::Simple->dclone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN>
)
Hash::Merge::Simple::dclone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN>
)
Perform a merge, clone the merge, and return the result
This is useful in cases where you need to ensure that the result can be
tweaked without fear of giving/receiving any side effects
This method will use Storable (dclone) to do the cloning
AUTHOR
Robert Krimen, "<rkrimen at cpan.org>"
SEE ALSO
Hash::Merge, Catalyst::Utils
BUGS
Please report any bugs or feature requests to "bug-hash-merge-simple at
rt.cpan.org", or through the web interface at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Hash-Merge-Simple
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Hash-Merge-Simple>. 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 Hash::Merge::Simple
You can also look for information at:
· RT: CPAN's request tracker
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Hash-Merge-Simple
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Hash-Merge-Simple>
· AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/Hash-Merge-Simple
<http://annocpan.org/dist/Hash-Merge-Simple>
· CPAN Ratings
http://cpanratings.perl.org/d/Hash-Merge-Simple
<http://cpanratings.perl.org/d/Hash-Merge-Simple>
· Search CPAN
http://search.cpan.org/dist/Hash-Merge-Simple
<http://search.cpan.org/dist/Hash-Merge-Simple>
ACKNOWLEDGEMENTS
This code was pretty much taken directly from Catalyst::Utils:
Sebastian Riedel "sri@cpan.org"
Yuval Kogman "nothingmuch@woobling.org"
COPYRIGHT & LICENSE
Copyright 2008 Robert Krimen, all rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.14.1 2011-06-20 Hash::Merge::Simple(3)
