NAME

       Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa - Write "eval {
       $foo->isa($pkg) }" instead of "UNIVERSAL::isa($foo, $pkg)".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

           print UNIVERSAL::isa($obj, 'Foo::Bar') ? 'yes' : 'no';  #not ok
           print eval { $obj->isa('Foo::Bar') } ? 'yes' : 'no';    #ok

       As of Perl 5.9.3, the use of "UNIVERSAL::isa" 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 "isa()", a technique
       which is crucial for implementing mock objects and some facades.

       Another alternative to UNIVERSAL::isa is the "_INSTANCE" method of Param::Util, which is
       faster.

       See the CPAN module UNIVERSAL::isa for an incendiary discussion of this topic.

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

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

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2006-2011 Chris Dolan.

       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.

perl v5.36.0                    Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa(3pm)