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.IX Title "Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan 3pm"
.TH Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan \- Write "eval { $foo\->can($name) }" instead of "UNIVERSAL::can($foo, $name)".
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
.Vb 2
\&    print UNIVERSAL::can($obj, \*(AqFoo::Bar\*(Aq) ? \*(Aqyes\*(Aq : \*(Aqno\*(Aq;  #not ok
\&    print eval { $obj\->can(\*(AqFoo::Bar\*(Aq) } ? \*(Aqyes\*(Aq : \*(Aqno\*(Aq;    #ok
.Ve
.PP
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 \f(CW\*(C`undef\*(C'\fR or an unblessed scalar.  However, the
functional form makes it impossible for packages to override \f(CWcan()\fR,
a technique which is crucial for implementing mock objects and some
facades.
.PP
See UNIVERSAL::can for a more thorough discussion of
this topic.
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa
.SH AUTHOR
.IX Header "AUTHOR"
Chris Dolan <cdolan@cpan.org>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2006\-2011 Chris Dolan.
.PP
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.