| Name : perl-Acme-Holy
| |
| Version : 0.03
| Vendor : obs://build_opensuse_org/devel:languages:perl
|
| Release : 8.90
| Date : 2024-08-28 23:01:52
|
| Group : Development/Libraries/Perl
| Source RPM : perl-Acme-Holy-0.03-8.90.src.rpm
|
| Size : 0.02 MB
| |
| Packager : (none)
| |
| Summary : Test whether references are blessed
|
Description :
*Acme::Holy* provides a single routine, *holy()*, which returns the name of
the package an object has been \'bless\'ed into, or \'undef\', if its first
argument is not a blessed reference.
Isn\'t this what \'ref()\' does already? Yes, and no. If given a blessed
reference, \'ref()\' will return the name of the package the reference has
been blessed into. However, if \'ref()\' is passed an unblessed reference,
then it will return the type of reference (e.g. \'SCALAR\', \'HASH\',
\'CODEREF\', etc). This means that a call to \'ref()\' by itself cannot
determine if a given reference is an object. *holy()* differs from \'ref()\'
by returning \'undef\' if its first argument is not a blessed reference (even
if it is a reference).
Can\'t we use \'UNIVERSAL::isa()\'? Yes, and no. If you already have an
object, then \'isa()\' will let you know if it inherits from a given class.
But what do we do if we know nothing of the inheritance tree of the
object\'s class? Also, if we don\'t have an object, just a normal reference,
then attempting to call \'isa()\' through it will result in a run-time error.
*holy()* is a quick, single test to determine if a given scalar represents
an object (i.e. a blessed reference).
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/perl:/CPAN-A/openSUSE_Tumbleweed/x86_64 |
