Tie::CPHash(3pm) User Contributed Perl Documentation Tie::CPHash(3pm)
NAME
Tie::CPHash - Case preserving but case insensitive hash table
VERSION
This document describes version 1.05 of Tie::CPHash, released January 20, 2012.
SYNOPSIS
require Tie::CPHash;
tie %cphash, 'Tie::CPHash';
$cphash{'Hello World'} = 'Hi there!';
printf("The key `%s' was used to store `%s'.
",
tied(%cphash)->key('HELLO WORLD'),
$cphash{'HELLO world'});
DESCRIPTION
The Tie::CPHash module provides a hash table that is case preserving but case insensitive. This means that
$cphash{KEY} $cphash{key}
$cphash{Key} $cphash{keY}
all refer to the same entry. Also, the hash remembers which form of the key was last used to store the entry. The "keys" and "each"
functions will return the key that was used to set the value.
An example should make this clear:
tie %h, 'Tie::CPHash';
$h{Hello} = 'World';
print $h{HELLO}; # Prints 'World'
print keys(%h); # Prints 'Hello'
$h{HELLO} = 'WORLD';
print $h{hello}; # Prints 'WORLD'
print keys(%h); # Prints 'HELLO'
The additional "key" method lets you fetch the case of a specific key:
# When run after the previous example, this prints 'HELLO':
print tied(%h)->key('Hello');
(The "tied" function returns the object that %h is tied to.)
If you need a case insensitive hash, but don't need to preserve case, just use $hash{lc $key} instead of $hash{$key}. This has a lot less
overhead than Tie::CPHash.
CONFIGURATION AND ENVIRONMENT
Tie::CPHash requires no configuration files or environment variables.
INCOMPATIBILITIES
None reported.
BUGS AND LIMITATIONS
No bugs have been reported.
AUTHOR
Christopher J. Madsen "<perl AT cjmweb.net>"
Please report any bugs or feature requests to "<bug-Tie-CPHash AT rt.cpan.org>" or through the web interface at
http://rt.cpan.org/Public/Bug/Report.html?Queue=Tie-CPHash <http://rt.cpan.org/Public/Bug/Report.html?Queue=Tie-CPHash>.
You can follow or contribute to Tie-CPHash's development at http://github.com/madsen/tie-cphash <http://github.com/madsen/tie-cphash>.
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Christopher J. Madsen.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT
WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
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RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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perl v5.14.2 2012-01-20 Tie::CPHash(3pm)