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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>GT::Cache - Tied hash which caches output of functions.</title>
<link rev="made" href="mailto:root@penguin.office.gossamer-threads.com" />
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<body style="background-color: white">
<p><a name="__index__"></a></p>
<!-- INDEX BEGIN -->
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#example">EXAMPLE</a></li>
<li><a href="#notes">NOTES</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
<li><a href="#version">VERSION</a></li>
</ul>
<!-- INDEX END -->
<hr />
<p>
</p>
<h1><a name="name">NAME</a></h1>
<p>GT::Cache - Tied hash which caches output of functions.</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
use GT::Cache;
my %cache;
tie %cache, 'GT::Cache', $size, \&amp;function;</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>GT::Cache implements a simple but quick caching scheme for remembering
the results of functions. It also implements a max size to prevent
the cache from growing and drops least frequently requested entries
first, making it very useful under mod_perl.</p>
<p>
</p>
<hr />
<h1><a name="example">EXAMPLE</a></h1>
<pre>
use GT::Cache;
my %cache;
tie %cache, 'GT::Cache', 100, \&amp;complex_func;
while (&lt;&gt;) {
print &quot;RESULT: &quot;, $cache{$_}, &quot;\n&quot;;
}</pre>
<pre>
sub complex_func {
my $input = shift;
# .. do complex work.
return $output;
}</pre>
<p>This will cache the results of complex_func, and only run it when
the input is different. It stores a max of 100 entries at a time,
with the least frequently requested getting dropped first.</p>
<p>
</p>
<hr />
<h1><a name="notes">NOTES</a></h1>
<p>Currently, you can only pass as input to the function a single
scalar, and the output must be a single scalar. See the
Memoize module in CPAN for a much more robust implementation.</p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright (c) 2004 Gossamer Threads Inc. All Rights Reserved.
<a href="http://www.gossamer-threads.com/">http://www.gossamer-threads.com/</a></p>
<p>
</p>
<hr />
<h1><a name="version">VERSION</a></h1>
<p>Revision: $Id: Cache.pm,v 1.13 2004/01/13 01:35:15 jagerman Exp $</p>
</body>
</html>