Perl::Critic::Policy::ControlStructures::ProhibitNegativeExpressionsInUnlessAndUntilConditions.3pm

Langue: en

Autres versions - même langue

Version: 2008-03-08 (mandriva - 01/05/08)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

Perl::Critic::Policy::ControlStructures::ProhibitNegativeExpressionsInUnlessAndUntilConditions

DESCRIPTION

   until ($foo ne 'blah') {          #not ok
       ...
   }
 
   while ($foo eq 'blah') {          #ok
       ...
   }

A number of people have problems figuring out the meaning of doubly negated expressions. "unless" and "until" are both negative constructs, so any negative (e.g. "!~") or reversible operators (e.g. "le") included in their conditional expressions are double negations. Conway considers the following operators to be difficult to understand within "unless" and "until":

   ! not
   !~ ne !=
   <   >   <=  >=  <=>
   lt  gt  le  ge  cmp

SEE ALSO

Perl::Critic::Policy::ControlStructures::ProhibitUnlessBlocks

AUTHOR

Elliot Shank "<perl@galumph.com>" Copyright (c) 2007-2008 Elliot Shank. 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.