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POWhen setting up Perl code to run as either a script or module, what is the reason for __PACKAGE__?
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2009-08-01T02:08:31.067
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2010-07-03T14:26:47.673
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2017-05-23T10:27:35.577
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<p>In this <a href="https://stackoverflow.com/questions/1131304/in-perl-how-can-i-find-out-if-my-file-is-being-used-as-a-module-or-run-as-a-scri">earlier Stackoverflow question</a> and especially <a href="http://www.perlmonks.org/?node_id=396759" rel="nofollow noreferrer">brian d foy's "How a Script Becomes a Module"</a> I've read about how to set up code so that it can be run as either a script or a module, using this technique:</p> <pre><code>package SomeModule; __PACKAGE__->run(@ARGV) unless caller(); sub run { # Do stuff here if you are running the file as # a script rather than a module. } </code></pre> <p>What is the purpose of <code>__PACKAGE__</code> in this setup? Why not just do this?</p> <pre><code>run(@ARGV) unless caller(); </code></pre>
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When setting up Perl code to run as either a script or module, what is the reason for __PACKAGE__?
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