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POImporting Conditionally Compiled Functions From a Perl Module
 

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  1. POImporting Conditionally Compiled Functions From a Perl Module
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    <p>I have a set of logging and debugging functions which I want to use across multiple modules / objects. I'd like to be able to turn them on / off globally using a command line switch.</p> <p>The following code does this, however, I would like to be able to omit the package name and keep everything in a single file.</p> <p><strong>More specifically, I would like to import the logging functions names into each module so that they can be called without any package name qualification ( similar to a C++ <code>use namespace;</code> directive ) and I want to be able to enable / disable them globally from the script which uses them as in my example code below.</strong></p> <p>This is related to two previous questions I asked, <a href="https://stackoverflow.com/questions/2460787/when-should-i-use-perls-autoload">here</a> and <a href="https://stackoverflow.com/questions/2621225/how-can-i-call-a-perl-package-i-define-in-the-same-file">here</a>.</p> <p>One other thing - I don't think I completely understand why the below code works.</p> <pre><code>#! /usr/bin/perl -w use strict; use Getopt::Long; { package LogFuncs; use threads; use Time::HiRes qw( gettimeofday ); # provide tcpdump style time stamp sub _gf_time { my ( $seconds, $microseconds ) = gettimeofday(); my @time = localtime($seconds); return sprintf( "%02d:%02d:%02d.%06ld", $time[2], $time[1], $time[0], $microseconds ); } sub logerr; sub compile { my %params = @_; *logerr = $params{do_logging} ? sub { my $msg = shift; warn _gf_time() . " Thread " . threads-&gt;tid() . ": $msg\n"; } : sub { }; } } { package FooObj; sub new { my $class = shift; bless {}, $class; }; sub foo_work { my $self = shift; # do some foo work LogFuncs::logerr($self); } } { package BarObj; sub new { my $class = shift; my $data = { fooObj =&gt; FooObj-&gt;new() }; bless $data, $class; } sub bar_work { my $self = shift; $self-&gt;{fooObj}-&gt;foo_work(); LogFuncs::logerr($self); } } my $do_logging = 0; GetOptions( "do_logging" =&gt; \$do_logging, ); LogFuncs::compile(do_logging =&gt; $do_logging); my $bar = BarObj-&gt;new(); LogFuncs::logerr("Created $bar"); $bar-&gt;bar_work(); </code></pre>
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