Hi Monks,

I asked a question here about overriding a module function and was directed to look at Sub::Install which I did. Here is a test example that I wrote. First here is the module that I want to use with the function I want to override:

package BaseModule;
use strict;

use Exporter;
our @ISA = qw( Exporter );
our @EXPORT = qw( function1 );
our @EXPORT_OK = qw( function2 );

sub function1 {
    print "Responding from Function 1\n";
    return 1;
}

sub function2 {
    print "Responding now from Function 2\n";
    function1();
    return 1;
}

1;
[download]

And here is the code that will do the overriding:

#! /usr/bin/perl 

use strict;
use warnings;

use BaseModule qw( function1 function2 );
use Sub::Install qw( reinstall_sub );


reinstall_sub ({ code => 'overridden',
    into => "BaseModule",
    as => "function1",
});

sub overridden { 
    print "I am the overridden function\n";
    function1(); 
}

function2();

exit;
[download]

Now a few Questions that I have:

• Calling function1 in my test program calls the original function function1 not the overridden function. Pray, why?
• To call the overridden function I need to qualify it with the package name: BaseModule::function1(). Why?

Many thanks for the benefit of your time and wisdom O monks

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