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list::util::xs(3pm) [osx man page]

List::Util::XS(3pm)					 Perl Programmers Reference Guide				       List::Util::XS(3pm)

List::Util::XS - Indicate if List::Util was compiled with a C compiler SYNOPSIS
use List::Util::XS 1.20; DESCRIPTION
"List::Util::XS" can be used as a dependency to ensure List::Util was installed using a C compiler and that the XS version is installed. During installation $List::Util::XS::VERSION will be set to "undef" if the XS was not compiled. Starting with release 1.23_03, Scalar-List-Util is always using the XS implementation, but for backwards compatibility, we still ship the "List::Util::XS" module which just loads "List::Util". SEE ALSO
Scalar::Util, List::Util, List::MoreUtils COPYRIGHT
Copyright (c) 2008 Graham Barr <>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.16.2 2012-10-11 List::Util::XS(3pm)

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Hash::Util(3pm) 					 Perl Programmers Reference Guide					   Hash::Util(3pm)

Hash::Util - A selection of general-utility hash subroutines SYNOPSIS
use Hash::Util qw(lock_keys unlock_keys lock_value unlock_value lock_hash unlock_hash); %hash = (foo => 42, bar => 23); lock_keys(%hash); lock_keys(%hash, @keyset); unlock_keys(%hash); lock_value (%hash, 'foo'); unlock_value(%hash, 'foo'); lock_hash (%hash); unlock_hash(%hash); DESCRIPTION
"Hash::Util" contains special functions for manipulating hashes that don't really warrant a keyword. By default "Hash::Util" does not export anything. Restricted hashes 5.8.0 introduces the ability to restrict a hash to a certain set of keys. No keys outside of this set can be added. It also introduces the ability to lock an individual key so it cannot be deleted and the value cannot be changed. This is intended to largely replace the deprecated pseudo-hashes. lock_keys unlock_keys lock_keys(%hash); lock_keys(%hash, @keys); Restricts the given %hash's set of keys to @keys. If @keys is not given it restricts it to its current keyset. No more keys can be added. delete() and exists() will still work, but will not alter the set of allowed keys. Note: the current implementation prevents the hash from being bless()ed while it is in a locked state. Any attempt to do so will raise an exception. Of course you can still bless() the hash before you call lock_keys() so this shouldn't be a problem. unlock_keys(%hash); Removes the restriction on the %hash's keyset. lock_value unlock_value lock_value (%hash, $key); unlock_value(%hash, $key); Locks and unlocks an individual key of a hash. The value of a locked key cannot be changed. %hash must have already been locked for this to have useful effect. lock_hash unlock_hash lock_hash(%hash); lock_hash() locks an entire hash, making all keys and values readonly. No value can be changed, no keys can be added or deleted. unlock_hash(%hash); unlock_hash() does the opposite of lock_hash(). All keys and values are made read/write. All values can be changed and keys can be added and deleted. AUTHOR
Michael G Schwern <> on top of code by Nick Ing-Simmons and Jeffrey Friedl. SEE ALSO
Scalar::Util, List::Util, Hash::Util perl v5.8.0 2002-06-01 Hash::Util(3pm)
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