/ 
Perl-Critic-1.079_003
River stage three • 131 direct dependents • 411 total dependents
/ Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan

NAME

Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan

DESCRIPTION

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 UNIVERSAL::can for a more thorough discussion of this topic.

SEE ALSO

Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa

AUTHOR

Chris Dolan <cdolan@cpan.org>

COPYRIGHT

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.