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8.220. 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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8.219. Tie::Memoize Book Index8.221. Tie::Scalar
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