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.IX Title "Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements 3pm"
.TH Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements \- Avoid putting conditional logic around compile\-time includes.
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Modules included via "use" are loaded at compile-time.  Placing conditional
logic around the "use" statement has no effect on whether the module will be
loaded.  Doing so can also serve to confuse the reader as to the author's
original intent.
.PP
If you need to conditionally load a module you should be using "require"
instead.
.PP
This policy will catch the following forms of conditional "use" statements:
.PP
.Vb 4
\&    # if\-elsif\-else
\&    if ($a == 1) { use Module; }
\&    if ($a == 1) { } elsif ($a == 2) { use Module; }
\&    if ($a == 1) { } else { use Module; }
\&
\&    # for/foreach
\&    for (1..$a) { use Module; }
\&    foreach (@a) { use Module; }
\&
\&    # while
\&    while ($a == 1) { use Module; }
\&
\&    # unless
\&    unless ($a == 1) { use Module; }
\&
\&    # until
\&    until ($a == 1) { use Module; }
\&
\&    # do\-condition
\&    do { use Module; } if $a == 1;
\&    do { use Module; } while $a == 1;
\&    do { use Module; } unless $a == 1;
\&    do { use Module; } until $a == 1;
\&
\&    # operator\-do
\&    $a == 1 || do { use Module; };
\&    $a == 1 && do { use Module; };
\&    $a == 1 or do { use Module; };
\&    $a == 1 and do { use Module; };
\&
\&    # non\-string eval
\&    eval { use Module; };
.Ve
.PP
Including a module via "use" in bare blocks, standalone do blocks, or
string evals is allowed.
.PP
.Vb 2
\&    # bare block
\&    { use Module; }
\&
\&    # do
\&    do { use Module; }
\&
\&    # string eval
\&    eval "use Module";
.Ve
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH AUTHOR
.IX Header "AUTHOR"
Peter Guzis <pguzis@cpan.org>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2010\-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.