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Tie::Proxy::Hash 1.01

  Date Added: May 06, 2010  |  Visits: 721

Tie::Proxy::Hash

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Tie::Proxy::Hash is a Perl module created to efficiently merge & translate hashes. SYNOPSIS my (%hash, $ref); $ref = tie %hash, Tie::Proxy::Hash, (bart => +{a => 1, b => 2}, maggie => +{a => 5, c => 6, e => 10}, ); $hash{a} == 1; # true $hash{b} == 2; # true (bart supercedes maggie) $hash{c} == 6; # true ! defined $hash{d}; # true $hash{e} == 10; # true $hash{c} = 9; # set in maggie $hash{d} = 12; # set in default $hash{f} = 11; # set in default $ref->add_hash(lisa, +{d => 3, b => 4}); $hash{c} == 9; # true $hash{b} == 2; # true (bart overrides lisa) $hash{d} == 3; # true (lisa overrides default) $hash{f} == 11; # true (only default knows f) Proxy hash requests for one or more other hashes, with intermediate value translation. Tie::Proxy::Hash merges hashes by maintaining a list of hashes to look up, and each key requested is looked up in each hash in order until a hit is found. Resultant values may be subject to a translating subr. In this way, hashes may be merged without the cost of by-value copying. A default backing hash is provided to store values not present in other hashes. Tying $ref = tie %hash, Tie::Proxy::Hash, bart => +{a => 1, b => 2}, maggie => +{a => 5, c => 6, e => 10} => sub {10*$_[0]}, ; Any arguments passed to tie are palmed off onto add_hash. Retrieving Values Values are retrieved by checking each hash in the order of insertion; the first hash found in which a given key exists supplies the value. The value is subject to translation if the given hash has an associated translator..

Requirements: No special requirements
Platforms: Linux
Keyword: Default Hash Hashes Libraries Perl Module Programming Tieproxyhash True
Users rating: 0/10

License: Freeware Size: 19.46 KB
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