ActiveState!

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


NAME

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


SUPPORTED PLATFORMS

  • Linux
  • Solaris
  • Windows
This module is not included with the standard ActivePerl distribution. It is available as a separate download using PPM.

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 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.


AUTHOR

Christopher J. Madsen <chris_madsen@geocities.com>

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