Fellow Monasterians,

I'm trying to get my head around my directory/file structure and how code gets passed around. To experiment I have laid out the barest of an example that still works, though I normally use CGI::Application and HTML::Template, but other than the instance script, the layout can be pretty much the same.

Questions: 1) General—is this a plausible layout? 2) Specific—why do I have to include use Common.pm in my Contact.pm, when it is using Main as base and Main already includes Common.pm? Other questions: what is inheriting what? if anything? or what could be inherited? and is that even the right word? Thanks in advance.

Structure: 

 /public_html/---+   
    |            |
    |            |
    |       calling.cgi
    |
    |
/applications/---+
                 |
                 |
              Main.pm
                 |
             Common.pm
                 |
             /Contact/--+
                        |
                        |
                    Contact.pm

[download]

calling.cgi 

#!/usr/local/bin/perl
use lib "/usr/home/bradcathey/applications/";
use strict;

use Contact::Contact;
print "done<br />";

[download]

Main.pm 

#!/usr/bin/perl

use strict;
use Common;

#usually CGI::Application, plug-ins, HTML::Template, etc.

print "Content-type: text/html\n\n";
print "main.pm<br />";
1;

[download]

Common.pm 

package Common;
use strict;

use Exporter 'import';
@EXPORT = qw( show_here );

sub show_here {
   print "common.pm<br />";
   return "thanks for contacting us";
}
1;

[download]

Contact.pm 

package Main::Contact;
use base qw( Main );

use Common; #why?
use strict; 

print "contact.pm<br />";

my $msg = show_here();
print $msg."<br />";

return 1;

[download]

html output:

main.pm
contact.pm
common.pm
thanks for contacting us
done

[download]
—Brad
"The important work of moving the world forward does not wait to be done by perfect men." George Eliot

In reply to Understanding module structure and inheritance by bradcathey

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