| /usr/local/perl/lib/site_perl/5.8.5/Perl/Critic/Policy/BuiltinFunctions/ProhibitUniversalCan.pm |
Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan
print UNIVERSAL::can($obj, 'Foo::Bar') ? 'yes' : 'no'; #not ok
print eval { $obj->can('Foo::Bar') } ? 'yes' : 'no'; #ok
As of Perl 5.9.3, the use of UNIVERSAL::can as a function has been
deprecated and the method form is preferred instead. Formerly, the
functional form was recommended because it gave valid results even
when the object was undef or an unblessed scalar. However, the
functional form makes it impossible for packages to override can(),
a technique which is crucial for implementing mock objects and some
facades.
See the CPAN module the UNIVERSAL::can manpage for a more thorough discussion of this topic.
the Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa manpage
Chris Dolan <cdolan@cpan.org>
Copyright (c) 2006 Chris Dolan. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.
| /usr/local/perl/lib/site_perl/5.8.5/Perl/Critic/Policy/BuiltinFunctions/ProhibitUniversalCan.pm |