Perl in a Nutshell

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Standard Modules
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8.156 Tie::RefHash

Provides the ability to use references as hash keys after you've tied a hash variable to the module:

use Tie::RefHash;

tie hashvariable, 'Tie::RefHash', list;
untie hashvariable;
Uses the TIEHASH interface and provides the same methods.

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8.155 Tie::Hash, Tie::StdHashBook Index8.157 Tie::Scalar, Tie::StdScalar