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How many times have you found yourself writing: if ($obj->isa('Something')) { and then shortly afterwards cursing and changing it to: if (Scalar::Util::blessed($obj) and $obj->isa('Something')) { Right. That's why this module exists. Since perl allows us to provide a subroutine reference or a method name to the -> operator when used as a method call, and a subroutine doesn't require the invocant to actually be an object, we can create safe versions of isa, can and friends by using a subroutine reference that only tries to call the method if it's used on an object. So: my $isa_Foo = $maybe_an_object->$_call_if_object(isa => 'Foo'); is equivalent to my $isa_Foo = do { if (Scalar::Util::blessed($maybe_an_object)) { $maybe_an_object->isa('Foo'); } else { undef; } }; Note that we don't handle trying class names, because many things are valid class names that you might not want to treat as one (like say "Matt") - the 'is_module_name' function from Module::Runtime is a good way to check for something you might be able to call methods on if you want to do that. We are careful to make sure that scalar/list context is preserved for the method that is eventually called.
| Package | Summary | Distribution | Download |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora Rawhide for x86_64 | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora Rawhide for aarch64 | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora Rawhide for ppc64le | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora Rawhide for s390x | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 40 for x86_64 | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 40 for aarch64 | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 40 for ppc64le | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-19.fc40.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 40 for s390x | perl-Safe-Isa-1.000010-19.fc40.noarch.rpm |
| perl-Safe-Isa-1.000010-17.fc39.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 39 for x86_64 | perl-Safe-Isa-1.000010-17.fc39.noarch.rpm |
| perl-Safe-Isa-1.000010-17.fc39.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 39 for aarch64 | perl-Safe-Isa-1.000010-17.fc39.noarch.rpm |
| perl-Safe-Isa-1.000010-17.fc39.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 39 for ppc64le | perl-Safe-Isa-1.000010-17.fc39.noarch.rpm |
| perl-Safe-Isa-1.000010-17.fc39.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 39 for s390x | perl-Safe-Isa-1.000010-17.fc39.noarch.rpm |
| perl-Safe-Isa-1.000010-16.fc38.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 38 for x86_64 | perl-Safe-Isa-1.000010-16.fc38.noarch.rpm |
| perl-Safe-Isa-1.000010-16.fc38.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 38 for aarch64 | perl-Safe-Isa-1.000010-16.fc38.noarch.rpm |
| perl-Safe-Isa-1.000010-16.fc38.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 38 for ppc64le | perl-Safe-Isa-1.000010-16.fc38.noarch.rpm |
| perl-Safe-Isa-1.000010-16.fc38.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 38 for s390x | perl-Safe-Isa-1.000010-16.fc38.noarch.rpm |
| perl-Safe-Isa-1.000010-15.fc37.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 37 for x86_64 | perl-Safe-Isa-1.000010-15.fc37.noarch.rpm |
| perl-Safe-Isa-1.000010-15.fc37.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 37 for aarch64 | perl-Safe-Isa-1.000010-15.fc37.noarch.rpm |
| perl-Safe-Isa-1.000010-15.fc37.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 37 for ppc64le | perl-Safe-Isa-1.000010-15.fc37.noarch.rpm |
| perl-Safe-Isa-1.000010-15.fc37.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Fedora 37 for s390x | perl-Safe-Isa-1.000010-15.fc37.noarch.rpm |
| perl-Safe-Isa-1.000010-1.25.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Tumbleweed for noarch | perl-Safe-Isa-1.000010-1.25.noarch.rpm |
| perl-Safe-Isa-1.000010-1.25.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Ports Tumbleweed for noarch | perl-Safe-Isa-1.000010-1.25.noarch.rpm |
| Call isa, can, does and DOES safely on things that may not be objects | perl-Safe-Isa-1.000010-1.7.noarch.rpm | ||
| perl-Safe-Isa-1.000010-1.el9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 9 for ppc64le | perl-Safe-Isa-1.000010-1.el9.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 9 for x86_64 | perl-Safe-Isa-1.000010-1.el9.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 9 for aarch64 | perl-Safe-Isa-1.000010-1.el9.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 9 for s390x | perl-Safe-Isa-1.000010-1.el9.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 8 for ppc64le | perl-Safe-Isa-1.000010-1.el8.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 8 for aarch64 | perl-Safe-Isa-1.000010-1.el8.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 8 for x86_64 | perl-Safe-Isa-1.000010-1.el8.noarch.rpm |
| perl-Safe-Isa-1.000010-1.el8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 8 for s390x | perl-Safe-Isa-1.000010-1.el8.noarch.rpm |
| perl-Safe-Isa-1.000010-bp156.3.1.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Leap 15.6 for noarch | perl-Safe-Isa-1.000010-bp156.3.1.noarch.rpm |
| perl-Safe-Isa-1.000010-bp155.2.12.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Leap 15.5 for noarch | perl-Safe-Isa-1.000010-bp155.2.12.noarch.rpm |
| perl-Safe-Isa-1.000010-bp154.1.30.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Leap 15.4 for noarch | perl-Safe-Isa-1.000010-bp154.1.30.noarch.rpm |
| perl-Safe-Isa-1.000010-bp153.1.15.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Leap 15.3 for noarch | perl-Safe-Isa-1.000010-bp153.1.15.noarch.rpm |
| perl-Safe-Isa-1.000010-lp152.3.2.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | OpenSuSE Leap 15.2 for noarch | perl-Safe-Isa-1.000010-lp152.3.2.noarch.rpm |
| perl-Safe-Isa-1.000005-2.el7.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 7 for ppc64le | perl-Safe-Isa-1.000005-2.el7.noarch.rpm |
| perl-Safe-Isa-1.000005-2.el7.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 7 for aarch64 | perl-Safe-Isa-1.000005-2.el7.noarch.rpm |
| perl-Safe-Isa-1.000005-2.el7.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 7 for ppc64 | perl-Safe-Isa-1.000005-2.el7.noarch.rpm |
| perl-Safe-Isa-1.000005-2.el7.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | EPEL 7 for x86_64 | perl-Safe-Isa-1.000005-2.el7.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia Cauldron for armv7hl | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia Cauldron for x86_64 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia Cauldron for aarch64 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 9 for i586 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 9 for armv7hl | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 9 for x86_64 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 9 for aarch64 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-4.mga9.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia Cauldron for i686 | perl-Safe-Isa-1.0.10-4.mga9.noarch.rpm |
| perl-Safe-Isa-1.0.10-3.mga8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 8 for aarch64 | perl-Safe-Isa-1.0.10-3.mga8.noarch.rpm |
| perl-Safe-Isa-1.0.10-3.mga8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 8 for x86_64 | perl-Safe-Isa-1.0.10-3.mga8.noarch.rpm |
| perl-Safe-Isa-1.0.10-3.mga8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 8 for armv7hl | perl-Safe-Isa-1.0.10-3.mga8.noarch.rpm |
| perl-Safe-Isa-1.0.10-3.mga8.noarch.html | Call isa, can, does and DOES safely on things that may not be objects | Mageia 8 for i586 | perl-Safe-Isa-1.0.10-3.mga8.noarch.rpm |
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