| Subject: | Attribute initialization vs Module loading |
| Date: | Thu, 30 Aug 2018 15:12:53 +0000 |
| To: | "bug-Moo [...] rt.cpan.org" <bug-Moo [...] rt.cpan.org> |
| From: | "Valderrama, Mario" <valderrama [...] strato.de> |
Hello,
I know this is probably not the best way to do this, but creating objects of subclasses from a function in the superclass
doesn't correctly initalize the attributes.
Say I have 3 files:
Foo.pm
package Foo;
use Moo;
use FooBar;
has foo => (is => 'ro');
sub make_foobar { FooBar->new(@_) }
1;
FooBar.pm
package FooBar;
use Moo;
extends 'Foo';
has bar => (is => 'ro');
1;
main.pl
#!/usr/bin/env perl
use strict;
use warnings;
use 5.026;
use lib '.';
use Foo;
my $foobar = Foo::make_foobar(foo => 'foo', bar => 'bar');
say $foobar->foo();
say $foobar->bar();
Invoking main.pl will yield the following:
$ perl main.pl
Use of uninitialized value in say at main.pl line 9.
bar
This however can be fixed by either adding a 'use FooBar;' before the 'use Foo;' in main.pl or by using Moose instead of Moo in any of the two modules.
Making one of these changes will then result in:
$ perl main.pl
foo
bar
I'm using:
- Perl 5.26.0 (installed with plenv)
- Moo 2.003004
- Moose 2.2011 (for reference)
- Fedora 28 with Kernel 4.17.18-200.x86_64
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