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Hash::NoVivify 0.01

  Date Added: October 24, 2010  |  Visits: 570

Hash::NoVivify

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Hash::NoVivify is a Perl extension for non-vivifying exists and defined functions. SYNOPSIS use Hash::NoVivify qw(Defined Exists); ... if (Exists(%hash, qw(key1 key2 ... keyn ))) { ... } if (Defined(%hash, qw(key1 key2 ... keyn))) { ... } When used on a hash, the exists() and defined() functions will create entries in a hash in order to evaluate the function. For instance, the code: %a = (a => 1, b=> 2); print "Doesnt existn" unless exists($a{c}); print "Also Doesnt existn" unless exists($a{c}->{d}); print "Oh, my, not goodn" if exists($a{c}); will print out: Doesnt exist Also Doesnt exist Oh, my, not good The Hash::NoVivify module provides two functions, Defined() and Exists(), which avoid this, at the cost of a slightly convoluted syntax. Both functions take a reference to a hash, followed by a list of descending keys defining the hash entry to be investigated..

Requirements: No special requirements
Platforms: Linux
Keyword: Defined Exists Extension Hash Hashnovivify Libraries Novivify Perl Print Programming
Users rating: 0/10

License: Freeware Size: 3.07 KB
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