Dependency of nagios-plugins-nwc-health-8.0-1.1.src.rpm

Name: perl-Safe-Isa

Project: openSUSE_13.2

Repository: oss

Title: Call isa, can, does and DOES safely on things that may not be objects

Description:
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 the Module::Runtime manpage is a good way to
check for something you might be able to call methods on if you want to do
that.

Version: 1.000005

Release: 1.2

Architecture: noarch

Size: 10.9 KB

Build Time: 2014-10-06 15:17:53 +0200 (over 9 years ago)