1Perl::Critic::Policy::SUPuseberrrlo:uC:toCinrntiertsii:bc:u:Pt:rePodohliPibecirytl:R:eDStouucbrurnmoSeuontrtitan(te3is)o:n:ProhibitReturnSort(3)
2
3
4

NAME

6       Perl::Critic::Policy::Subroutines::ProhibitReturnSort - Behavior of
7       "sort" is not defined if called in scalar context.
8

AFFILIATION

10       This Policy is part of the core Perl::Critic distribution.
11

DESCRIPTION

13       The behavior of the builtin "sort" function is not defined if called in
14       scalar context.  So if you write a subroutine that directly "return"s
15       the result of a "sort" operation, then you code will behave
16       unpredictably if someone calls your subroutine in a scalar context.
17       This Policy emits a violation if the "return" keyword is directly
18       followed by the "sort" function.  To safely return a sorted list of
19       values from a subroutine, you should assign the sorted values to a
20       temporary variable first.  For example:
21
22          sub frobulate {
23
24              return sort @list;  # not ok!
25
26              my @sorted_list = sort @list;
27              return @sorted_list # OK
28          }
29

KNOWN BUGS

31       This Policy is not sensitive to the "wantarray" function.  So the
32       following code would generate a false violation:
33
34          sub frobulate {
35
36              if (wantarray) {
37                  return sort @list;
38              }
39              else{
40                  return join @list;
41              }
42          }
43

CONFIGURATION

45       This Policy is not configurable except for the standard options.
46

CREDITS

48       This Policy was suggested by Ulrich Wisser and the <http://iis.se>
49       team.
50

AUTHOR

52       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
53
55       Copyright (c) 2005-2017 Imaginative Software Systems.  All rights
56       reserved.
57
58       This program is free software; you can redistribute it and/or modify it
59       under the same terms as Perl itself.  The full text of this license can
60       be found in the LICENSE file included with this module.
61
62
63
64perl v5.32.0          Perl::Critic2:0:2P0o-l0i7c-y2:8:Subroutines::ProhibitReturnSort(3)
Impressum