Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)
                                           User Contributed Perl Documentation


NAME
       Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use
       4-argument "substr" instead of writing "substr($foo, 2, 6) = $bar".

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

DESCRIPTION
       Conway discourages the use of substr() as an lvalue, instead
       recommending that the 4-argument version of substr() be used instead.

           substr($something, 1, 2) = $newvalue;     # not ok
           substr($something, 1, 2, $newvalue);      # ok

       The four-argument form of substr() was introduced in Perl 5.005.  This
       policy does not report violations on code which explicitly specifies an
       earlier version of Perl (e.g. "use 5.004;").

CONFIGURATION
       This Policy is not configurable except for the standard options.

SEE ALSO
       "substr" in perlfunc (or "perldoc -f substr").

       "4th argument to substr" in perl5005delta

AUTHOR
       Graham TerMarsch <graham@howlingfrog.com>

COPYRIGHT
       Copyright (c) 2005-2011 Graham TerMarsch.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

perl v5.38.0                      2023-07-26
             Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)