Bug #73677 for Scalar-Defer: Dealing with undefined values

Mon Jan 02 12:19:28 2012 SREZIC [...] cpan.org - Ticket created

Subject:

Dealing with undefined values

It seems that it's not possible to store an undefined value in a lazy variable. Both test cases in the following script fail (but it works if my $undefined=undef is used instead): #!/usr/bin/perl use strict; use warnings; use Scalar::Defer 'lazy'; use Test::More 'no_plan'; my $undefined = lazy { undef }; ok !defined $undefined; is $undefined, undef; __END__ Regards, Slaven

Mon Jan 02 12:57:55 2012 $_ = 'spro^^*%*^6ut# [...] &$%*c>#!^!#&!pan.org'; y/a-z.@//cd; print - Correspondence added

On Mon Jan 02 12:19:28 2012, SREZIC wrote: Show quoted text

> It seems that it's not possible to store an undefined value in a lazy > variable. Both test cases in the following script fail (but it works if > my $undefined=undef is used instead): > > #!/usr/bin/perl > use strict; > use warnings; > use Scalar::Defer 'lazy'; > use Test::More 'no_plan'; > my $undefined = lazy { undef }; > ok !defined $undefined; > is $undefined, undef; > __END__

It’s not possible to override definedness, except perhaps by overriding CORE::GLOBAL::defined. If Scalar::Defer were to use ties, it might be possible to make this work, but the interface would have to change. Maybe something like lazy { undef } $undefined;

Mon Jan 02 12:57:56 2012 The RT System itself - Status changed from 'new' to 'open'