NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitBarewordDoubleColon - don't use Foo::
       style barewords

DESCRIPTION

       This policy is part of the "Perl::Critic::Pulp" add-on.  It asks you not to use the
       double-colon bareword like

           $class = Foo::Bar::;     # bad

       but instead a plain string

           $class = 'Foo::Bar';     # ok

       This is intended as a building block for a restricted coding style, or a matter of
       personal preference if you think the "::" is a bit obscure and that it's clearer to write
       a string when you mean a string.  On that basis the policy is lowest severity and under
       the "cosmetic" theme (see "POLICY THEMES" in Perl::Critic).

   Indirect Object Syntax
       By default a double-colon is allowed in the indirect object syntax (see "Indirect Object
       Syntax" in perlobj).

           my $obj = new Foo::Bar:: $arg1,$arg2;   # ok

       This is because "::" there is important to disambiguate a class name "Foo::Bar" from a
       function "Foo::Bar()", ie. function "Bar()" in package "Foo".

       Whether you actually want indirect object syntax is a matter for other policies, like
       "ProhibitIndirectSyntax".  If you don't want the double-colon bareword then change to
       arrow style "Foo::Bar->new($arg,...)".

   Double-Colon Advantages
       The "::" bareword is for use on package names, not general bareword quoting.  If there's
       no such package at compile time a warning is given (see "Bareword "%s" refers to
       nonexistent package" in perldiag)

           my $class = No::Such::Package::;  # Perl warning

       This warning can help pick up typos, though it relies on relevant packages being loaded at
       compile-time (ie. "BEGIN").  If the package is loaded by a "require" at runtime then the
       warning fires even though the code runs correctly.  For reference, a warning isn't given
       for the indirect object syntax, which rather limits its benefit.

   Disabling
       If you don't care about this you can always disable "ProhibitBarewordDoubleColon" from
       your .perlcriticrc in the usual way (see "CONFIGURATION" in Perl::Critic),

           [-ValuesAndExpressions::ProhibitBarewordDoubleColon]

CONFIGURATION

       "allow_indirect_syntax" (boolean, default true)
           If true then allow double-colon in the indirect object syntax as shown above.  If
           false then report double-colons everywhere as violations

               # bad under allow_indirect_syntax=false
               my $obj = new Foo::Bar:: $arg1,$arg2;

           This can be controlled from your ~/.perlcriticrc in the usual way.  For example

               [ValuesAndExpressions::ProhibitBarewordDoubleColon]
               allow_indirect_syntax=no

SEE ALSO

       Perl::Critic::Pulp, Perl::Critic, Perl::Critic::Policy::Objects::ProhibitIndirectSyntax

       ""Foo::" can be used as implicitly quoted package name" in perl5005delta

HOME PAGE

       http://user42.tuxfamily.org/perl-critic-pulp/index.html

COPYRIGHT

       Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019, 2021 Kevin Ryde

       Perl-Critic-Pulp is free software; you can redistribute it and/or modify it under the
       terms of the GNU General Public License as published by the Free Software Foundation;
       either version 3, or (at your option) any later version.

       Perl-Critic-Pulp is distributed in the hope that it will be useful, but WITHOUT ANY
       WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with Perl-Critic-
       Pulp.  If not, see <http://www.gnu.org/licenses>.

perl v5.32.1         Perl::Critic::Policy::ValuesAndExpressions::ProhibitBarewordDoubleColon(3pm)