NAME

       Tie::CPHash - Case preserving but case insensitive hash table

VERSION

       This document describes version 1.06 of Tie::CPHash, released November 9, 2013.

SYNOPSIS

           require Tie::CPHash;
           tie %cphash, 'Tie::CPHash';

           $cphash{'Hello World'} = 'Hi there!';
           printf("The key `%s' was used to store `%s'.\n",
                  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>.

       You can follow or contribute to Tie-CPHash's development at
       <https://github.com/madsen/tie-cphash>.

COPYRIGHT AND LICENSE

       This software is copyright (c) 2013 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. THE ENTIRE RISK AS TO
       THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE
       DEFECTIVE, YOU ASSUME THE COST OF 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 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
       SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
       LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY
       OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
       SUCH DAMAGES.