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.\" ========================================================================
.\"
.IX Title "Tie::CPHash 3pm"
.TH Tie::CPHash 3pm "2012-01-20" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Tie::CPHash \- Case preserving but case insensitive hash table
.SH "VERSION"
.IX Header "VERSION"
This document describes version 1.05 of
Tie::CPHash, released January 20, 2012.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    require Tie::CPHash;
\&    tie %cphash, \*(AqTie::CPHash\*(Aq;
\&
\&    $cphash{\*(AqHello World\*(Aq} = \*(AqHi there!\*(Aq;
\&    printf("The key \`%s\*(Aq was used to store \`%s\*(Aq.\en",
\&           tied(%cphash)\->key(\*(AqHELLO WORLD\*(Aq),
\&           $cphash{\*(AqHELLO world\*(Aq});
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The Tie::CPHash module provides a hash table that is case
preserving but case insensitive.  This means that
.PP
.Vb 2
\&    $cphash{KEY}    $cphash{key}
\&    $cphash{Key}    $cphash{keY}
.Ve
.PP
all refer to the same entry.  Also, the hash remembers which form of
the key was last used to store the entry.  The \f(CW\*(C`keys\*(C'\fR and \f(CW\*(C`each\*(C'\fR
functions will return the key that was used to set the value.
.PP
An example should make this clear:
.PP
.Vb 7
\&    tie %h, \*(AqTie::CPHash\*(Aq;
\&    $h{Hello} = \*(AqWorld\*(Aq;
\&    print $h{HELLO};            # Prints \*(AqWorld\*(Aq
\&    print keys(%h);             # Prints \*(AqHello\*(Aq
\&    $h{HELLO} = \*(AqWORLD\*(Aq;
\&    print $h{hello};            # Prints \*(AqWORLD\*(Aq
\&    print keys(%h);             # Prints \*(AqHELLO\*(Aq
.Ve
.PP
The additional \f(CW\*(C`key\*(C'\fR method lets you fetch the case of a specific key:
.PP
.Vb 2
\&    # When run after the previous example, this prints \*(AqHELLO\*(Aq:
\&    print tied(%h)\->key(\*(AqHello\*(Aq);
.Ve
.PP
(The \f(CW\*(C`tied\*(C'\fR function returns the object that \f(CW%h\fR is tied to.)
.PP
If you need a case insensitive hash, but don't need to preserve case,
just use \f(CW$hash{lc $key}\fR instead of \f(CW$hash{$key}\fR.  This has a lot
less overhead than Tie::CPHash.
.SH "CONFIGURATION AND ENVIRONMENT"
.IX Header "CONFIGURATION AND ENVIRONMENT"
Tie::CPHash requires no configuration files or environment variables.
.SH "INCOMPATIBILITIES"
.IX Header "INCOMPATIBILITIES"
None reported.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
No bugs have been reported.
.SH "AUTHOR"
.IX Header "AUTHOR"
Christopher J. Madsen  \f(CW\*(C`<perl\ AT\ cjmweb.net>\*(C'\fR
.PP
Please report any bugs or feature requests
to \f(CW\*(C`<bug\-Tie\-CPHash\ AT\ rt.cpan.org>\*(C'\fR
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>.
.PP
You can follow or contribute to Tie-CPHash's development at
http://github.com/madsen/tie\-cphash <http://github.com/madsen/tie-cphash>.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2012 by Christopher J. Madsen.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
.SH "DISCLAIMER OF WARRANTY"
.IX Header "DISCLAIMER OF WARRANTY"
\&\s-1BECAUSE\s0 \s-1THIS\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1LICENSED\s0 \s-1FREE\s0 \s-1OF\s0 \s-1CHARGE\s0, \s-1THERE\s0 \s-1IS\s0 \s-1NO\s0 \s-1WARRANTY\s0
\&\s-1FOR\s0 \s-1THE\s0 \s-1SOFTWARE\s0, \s-1TO\s0 \s-1THE\s0 \s-1EXTENT\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0. \s-1EXCEPT\s0 \s-1WHEN\s0
\&\s-1OTHERWISE\s0 \s-1STATED\s0 \s-1IN\s0 \s-1WRITING\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1AND/OR\s0 \s-1OTHER\s0 \s-1PARTIES\s0
\&\s-1PROVIDE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R" \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EITHER\s0
\&\s-1EXPRESSED\s0 \s-1OR\s0 \s-1IMPLIED\s0, \s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1THE\s0 \s-1IMPLIED\s0
\&\s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0 \s-1AND\s0 \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0. \s-1THE\s0
\&\s-1ENTIRE\s0 \s-1RISK\s0 \s-1AS\s0 \s-1TO\s0 \s-1THE\s0 \s-1QUALITY\s0 \s-1AND\s0 \s-1PERFORMANCE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1WITH\s0
\&\s-1YOU\s0. \s-1SHOULD\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1PROVE\s0 \s-1DEFECTIVE\s0, \s-1YOU\s0 \s-1ASSUME\s0 \s-1THE\s0 \s-1COST\s0 \s-1OF\s0 \s-1ALL\s0
\&\s-1NECESSARY\s0 \s-1SERVICING\s0, \s-1REPAIR\s0, \s-1OR\s0 \s-1CORRECTION\s0.
.PP
\&\s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1UNLESS\s0 \s-1REQUIRED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0 \s-1OR\s0 \s-1AGREED\s0 \s-1TO\s0 \s-1IN\s0 \s-1WRITING\s0
\&\s-1WILL\s0 \s-1ANY\s0 \s-1COPYRIGHT\s0 \s-1HOLDER\s0, \s-1OR\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1WHO\s0 \s-1MAY\s0 \s-1MODIFY\s0 \s-1AND/OR\s0
\&\s-1REDISTRIBUTE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1AS\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1THE\s0 \s-1ABOVE\s0 \s-1LICENSE\s0, \s-1BE\s0
\&\s-1LIABLE\s0 \s-1TO\s0 \s-1YOU\s0 \s-1FOR\s0 \s-1DAMAGES\s0, \s-1INCLUDING\s0 \s-1ANY\s0 \s-1GENERAL\s0, \s-1SPECIAL\s0, \s-1INCIDENTAL\s0,
\&\s-1OR\s0 \s-1CONSEQUENTIAL\s0 \s-1DAMAGES\s0 \s-1ARISING\s0 \s-1OUT\s0 \s-1OF\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1INABILITY\s0 \s-1TO\s0 \s-1USE\s0
\&\s-1THE\s0 \s-1SOFTWARE\s0 (\s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1LOSS\s0 \s-1OF\s0 \s-1DATA\s0 \s-1OR\s0 \s-1DATA\s0 \s-1BEING\s0
\&\s-1RENDERED\s0 \s-1INACCURATE\s0 \s-1OR\s0 \s-1LOSSES\s0 \s-1SUSTAINED\s0 \s-1BY\s0 \s-1YOU\s0 \s-1OR\s0 \s-1THIRD\s0 \s-1PARTIES\s0 \s-1OR\s0 A
\&\s-1FAILURE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1TO\s0 \s-1OPERATE\s0 \s-1WITH\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1SOFTWARE\s0), \s-1EVEN\s0 \s-1IF\s0
\&\s-1SUCH\s0 \s-1HOLDER\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1HAS\s0 \s-1BEEN\s0 \s-1ADVISED\s0 \s-1OF\s0 \s-1THE\s0 \s-1POSSIBILITY\s0 \s-1OF\s0
\&\s-1SUCH\s0 \s-1DAMAGES\s0.