NAME

Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode - Don't write code after an unconditional die, exit, or next.

AFFILIATION

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

DESCRIPTION

This policy prohibits code following a statement which unconditionally alters the program flow. This includes calls to exit, die, return, next, last and goto. Due to common usage, croak and confess from Carp are also included.

Code is reachable if any of the following conditions are true:

• Flow-altering statement has a conditional attached to it
• Statement is on the right side of an operator &&, ||, //, and, or, or err.
• Code is prefixed with a label (can potentially be reached via goto)
• Code is a subroutine

EXAMPLES

  # not ok

  exit;
  print "123\n";

  # ok

  exit if !$xyz;
  print "123\n";

  # 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\n";

  # ok

  die;
  LABEL: print "123\n";

  # not ok

  croak;
  do_something();

  # ok

  croak;
  sub do_something {}

CONFIGURATION

This Policy is not configurable except for the standard options.

SEE ALSO

Perl::Critic::Policy::ControlStructures::ProhibitPostfixControls

AUTHOR

Peter Guzis <pguzis@cpan.org>

COPYRIGHT

Copyright (c) 2006-2009 Peter Guzis. 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.