Perl::Critic::Policy::ClassHierarchies::ProhibitExplicitISA - Employ C<use base> instead of C<@ISA>.

Perl-Critic documentation Contained in the Perl-Critic distribution.

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NAME

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Perl::Critic::Policy::ClassHierarchies::ProhibitExplicitISA - Employ use base instead of @ISA.

AFFILIATION

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

DESCRIPTION

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Conway recommends employing use base qw(Foo) instead of the usual our @ISA = qw(Foo) because the former happens at compile time and the latter at runtime. The base pragma also automatically loads Foo for you so you save a line of easily-forgotten code.

CONFIGURATION

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This Policy is not configurable except for the standard options.

NOTE

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Some people prefer parent over base.

AUTHOR

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Chris Dolan <cdolan@cpan.org>

COPYRIGHT

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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.

Perl-Critic documentation Contained in the Perl-Critic distribution. 
##############################################################################
#      $URL: http://perlcritic.tigris.org/svn/perlcritic/trunk/distributions/Perl-Critic/lib/Perl/Critic/Policy/ClassHierarchies/ProhibitExplicitISA.pm $
#     $Date: 2011-05-15 16:34:46 -0500 (Sun, 15 May 2011) $
#   $Author: clonezone $
# $Revision: 4078 $
##############################################################################

package Perl::Critic::Policy::ClassHierarchies::ProhibitExplicitISA;

use 5.006001;
use strict;
use warnings;
use Readonly;

use Perl::Critic::Utils qw{ :severities };
use base 'Perl::Critic::Policy';

our $VERSION = '1.116';

#-----------------------------------------------------------------------------

Readonly::Scalar my $DESC => q{@ISA used instead of "use base"}; ## no critic (RequireInterpolation)
Readonly::Scalar my $EXPL => [ 360 ];

#-----------------------------------------------------------------------------

sub supported_parameters { return ()                         }
sub default_severity     { return $SEVERITY_MEDIUM           }
sub default_themes       { return qw( core maintenance pbp ) }
sub applies_to           { return 'PPI::Token::Symbol'       }

#-----------------------------------------------------------------------------

sub violates {
    my ($self, $elem, undef) = @_;

    if( $elem eq q{@ISA} ) {  ## no critic (RequireInterpolation)
        return $self->violation( $DESC, $EXPL, $elem );
    }
    return; #ok!
}

1;

#-----------------------------------------------------------------------------

__END__


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