[Bug 2055608] Perl 5.32.1 Incorrectly Processes Hash Key Existence in Two-Dimensional Hashes
https://bugzilla.redhat.com/show_bug.cgi?id=2055608 --- Comment #3 from BZ --- Thanks for that. Even though semantically it seems like it SHOULD be a bug, for better or worse at least it's not something unexpected. I just didn't find any reference to that behavior in the documents I checked. Thanks! -- You are receiving this mail because: You are on the CC list for the bug. https://bugzilla.redhat.com/show_bug.cgi?id=2055608 ___ perl-devel mailing list -- perl-devel@lists.fedoraproject.org To unsubscribe send an email to perl-devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/perl-devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
[Bug 2055608] Perl 5.32.1 Incorrectly Processes Hash Key Existence in Two-Dimensional Hashes
https://bugzilla.redhat.com/show_bug.cgi?id=2055608
Jitka Plesnikova changed:
What|Removed |Added
Resolution|--- |NOTABUG
Doc Type|--- |If docs needed, set a value
Status|NEW |CLOSED
Last Closed||2022-02-17 11:42:53
--- Comment #1 from Jitka Plesnikova ---
This behavior is describe in perldoc for 'exists':
Note that the EXPR can be arbitrarily complicated as long as the
final operation is a hash or array key lookup or subroutine
name:
if (exists $ref->{A}->{B}->{$key}) { }
if (exists $hash{A}{B}{$key}) { }
if (exists $ref->{A}->{B}->[$ix]) { }
if (exists $hash{A}{B}[$ix]){ }
if (exists &{$ref->{A}{B}{$key}}) { }
Although the most deeply nested array or hash element will not
spring into existence just because its existence was tested, any
intervening ones will. Thus "$ref->{"A"}" and
"$ref->{"A"}->{"B"}" will spring into existence due to the
existence test for the $key element above. This happens anywhere
the arrow operator is used, including even here:
undef $ref;
if (exists $ref->{"Some key"}){ }
print $ref; # prints HASH(0x80d3d5c)
--
You are receiving this mail because:
You are on the CC list for the bug.
https://bugzilla.redhat.com/show_bug.cgi?id=2055608
___
perl-devel mailing list -- perl-devel@lists.fedoraproject.org
To unsubscribe send an email to perl-devel-le...@lists.fedoraproject.org
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedoraproject.org/archives/list/perl-devel@lists.fedoraproject.org
Do not reply to spam on the list, report it:
https://pagure.io/fedora-infrastructure
[Bug 2055608] Perl 5.32.1 Incorrectly Processes Hash Key Existence in Two-Dimensional Hashes
https://bugzilla.redhat.com/show_bug.cgi?id=2055608 --- Comment #2 from Petr Pisar --- This feature is called "autovivification". See perlref POD. -- You are receiving this mail because: You are on the CC list for the bug. https://bugzilla.redhat.com/show_bug.cgi?id=2055608 ___ perl-devel mailing list -- perl-devel@lists.fedoraproject.org To unsubscribe send an email to perl-devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/perl-devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
