I want a Moose object to behave differently depending upon which package has created the object. For example, if the "Teacher" package create the "Child" object, I want the "Child" object to behave different than if the "Parent" object created the "Child" object.

To accomplish this, I have something like the following code: 

 1 #! /usr/bin/env perl
 2 use strict;
 3 use warnings;
 4
 5 package Child;
 6 use Moose;
 7
 8 has 'context' => (is => 'rw');
 9
10 sub BUILD {
11   my $s = shift;
12   my ($pkg) = caller 4;
13   $s->context('Teacher') if $pkg eq 'Teacher';
14   $s->context('Parent') if $pkg eq 'Parent';
15 }
16
17 package Teacher;
18 my $tom = Child->new();
19 print $tom->context . "\n";
20
21 package Parent;
22 my $kit = Child->new();
23 print $kit->context . "\n";

[download]

This works, but it is dependent upon line 12 guessing that the original caller being 4 (5?) levels deep.If Moose internals change at all, the code will break. So I'm wondering if there might be a more reliable and documented way of accomplishing this. Or perhaps it's best to pass in the "context" as an argument to the constructor (though this seems like a less cool approach)? It also seems like this approach could have a proper name in computer science but I'm not aware of. If you can educate me, I'd appreciate it. Thanks!

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In reply to What is a reliable way to get the package of the code creating a Moose object? by nysus

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