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.IX Title "Perl::Critic::Policy::CodeLayout::ProhibitParensWithBuiltins 3pm"
.TH Perl::Critic::Policy::CodeLayout::ProhibitParensWithBuiltins 3pm "2018-07-27" "perl v5.26.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::CodeLayout::ProhibitParensWithBuiltins \- Write "open $handle, $path" instead of "open($handle, $path)".
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Conway suggests that all built-in functions be called without
parentheses around the argument list.  This reduces visual clutter and
disambiguates built-in functions from user functions.  Exceptions are
made for \f(CW\*(C`my\*(C'\fR, \f(CW\*(C`local\*(C'\fR, and \f(CW\*(C`our\*(C'\fR which require parentheses when
called with multiple arguments.
.PP
.Vb 2
\&    open($handle, \*(Aq>\*(Aq, $filename); #not ok
\&    open $handle, \*(Aq>\*(Aq, $filename;  #ok
\&
\&    split(/$pattern/, @list); #not ok
\&    split /$pattern/, @list;  #ok
.Ve
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH "NOTES"
.IX Header "NOTES"
Coding with parentheses can sometimes lead to verbose and awkward
constructs, so I think the intent of Conway's guideline is to remove
only the \fIunnecessary\fR parentheses.  This policy makes exceptions for
some common situations where parentheses are usually required.
However, you may find other situations where the parentheses are
necessary to enforce precedence, but they cause still violations.  In
those cases, consider using the '## no critic' comments to silence
Perl::Critic.
.SH "BUGS"
.IX Header "BUGS"
Some builtin functions (particularly those that take a variable number
of scalar arguments) should probably get parentheses.  This policy
should be enhanced to allow the user to specify a list of builtins
that are exempt from the policy.
.SH "AUTHOR"
.IX Header "AUTHOR"
Jeffrey Ryan Thalhammer <jeff@imaginative\-software.com>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2005\-2011 Imaginative Software Systems.  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 \s-1LICENSE\s0 file included with this module.