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.IX Title "Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode 3pm"
.TH Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode \- Don't write code after an unconditional "die, exit, or next".
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This policy prohibits code following a statement which unconditionally
alters the program flow.  This includes calls to \f(CW\*(C`exit\*(C'\fR, \f(CW\*(C`die\*(C'\fR,
\&\f(CW\*(C`return\*(C'\fR, \f(CW\*(C`next\*(C'\fR, \f(CW\*(C`last\*(C'\fR and \f(CW\*(C`goto\*(C'\fR.  Due to common usage,
\&\f(CW\*(C`croak\*(C'\fR and \f(CW\*(C`confess\*(C'\fR from Carp are also included.
.PP
Code is reachable if any of the following conditions are true:
.IP \(bu 4
Flow-altering statement has a conditional attached to it
.IP \(bu 4
Statement is on the right side of an operator \f(CW\*(C`&&\*(C'\fR, \f(CW\*(C`||\*(C'\fR, \f(CW\*(C`//\*(C'\fR, \f(CW\*(C`and\*(C'\fR, \f(CW\*(C`or\*(C'\fR, or \f(CW\*(C`err\*(C'\fR.
.IP \(bu 4
Code is prefixed with a label (can potentially be reached via \f(CW\*(C`goto\*(C'\fR)
.IP \(bu 4
Code is a subroutine
.SH EXAMPLES
.IX Header "EXAMPLES"
.Vb 1
\&  # not ok
\&
\&  exit;
\&  print "123\en";
\&
\&  # ok
\&
\&  exit if !$xyz;
\&  print "123\en";
\&
\&  # not ok
\&
\&  for ( 1 .. 10 ) {
\&      next;
\&      print 1;
\&  }
\&
\&  # ok
\&
\&  for ( 1 .. 10 ) {
\&      next if $_ == 5;
\&      print 1;
\&  }
\&
\&  # not ok
\&
\&  sub foo {
\&      my $bar = shift;
\&      return;
\&      print 1;
\&  }
\&
\&  # ok
\&
\&  sub foo {
\&      my $bar = shift;
\&      return if $bar\->baz();
\&      print 1;
\&  }
\&
\&
\&  # not ok
\&
\&  die;
\&  print "123\en";
\&
\&  # ok
\&
\&  die;
\&  LABEL: print "123\en";
\&
\&  # not ok
\&
\&  croak;
\&  do_something();
\&
\&  # ok
\&
\&  croak;
\&  sub do_something {}
.Ve
.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::ControlStructures::ProhibitPostfixControls
.SH AUTHOR
.IX Header "AUTHOR"
Peter Guzis <pguzis@cpan.org>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2006\-2011 Peter Guzis.  All rights reserved.
.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.