=head1 VERSION
-Version 0.02
+Version 0.04
=cut
our $VERSION;
BEGIN {
- $VERSION = '0.02';
+ $VERSION = '0.04';
}
=head1 SYNOPSIS
C<'fetch'>
Turn off autovivification for rvalue dereferencing expressions, such as C<< $value = $hashref->{key}[$idx]{$field} >>, C<< keys %{$hashref->{key}} >> or C<< values %{$hashref->{key}} >>.
+Starting from perl C<5.11>, it also covers C<keys> and C<values> on array references.
When the expression would have autovivified, C<undef> is returned for a plain fetch, while C<keys> and C<values> return C<0> in scalar context and the empty list in list context.
=item *
C<'store'>
-Turn off autovivification for lvalue dereferencing expressions, such as C<< $hashref->{key}[$idx]{$field} = $value >>.
+Turn off autovivification for lvalue dereferencing expressions, such as C<< $hashref->{key}[$idx]{$field} = $value >> or C<< for ($hashref->{key}[$idx]{$field}) { ... } >>.
An exception is thrown if vivification is needed to store the value, which means that effectively you can only assign to levels that are already defined (in the example, this would require C<< $hashref->{key}[$idx] >> to already be a hash reference).
=item *
();
}
+=head1 CAVEATS
+
+The pragma doesn't apply when one dereferences the returned value of an array or hash slice, as in C<< @array[$id]->{member} >> or C<< @hash{$key}->{member} >>.
+This syntax is valid Perl, yet it's discouraged as the slice is here useless since the dereferencing enforces scalar context.
+If warnings are turned on, Perl will complain about one-element slices.
+
=head1 DEPENDENCIES
L<perl> 5.8.
=head1 COPYRIGHT & LICENSE
-Copyright 2009 Vincent Pit, all rights reserved.
+Copyright 2009,2010 Vincent Pit, all rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.