1 package MooseX::UndefTolerant::Attribute;
4 around('initialize_instance_slot', sub {
8 my $ia = $self->init_arg;
10 # $_[2] is the hashref of options passed to the constructor. If our
11 # parameter passed in was undef, pop it off the args...
12 pop unless (defined $ia && defined($_[2]->{$ia}));
14 # Invoke the real init, as the above line cleared the unef
20 # ABSTRACT: Make your attribute(s) tolerant to undef intitialization
29 use MooseX::UndefTolerant::Attribute;
32 traits => [ qw(MooseX::UndefTolerant::Attribute)],
35 predicate => 'has_bar'
38 # Meanwhile, under the city...
41 my $class = My::Class->new(bar => undef);
42 $class->has_bar # False!
46 Applying this trait to your attribute makes it's initialization tolerant of
47 of undef. If you specify the value of undef to any of the attributes they
48 will not be initialized (or will be set to the default, if applicable).
49 Effectively behaving as if you had not provided a value at all.