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Compress	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Config	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
DBM_Filter	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Devel	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Digest	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Encode	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Exporter	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
ExtUtils	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
File	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Filter	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Getopt	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
HTTP	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
I18N	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
IO	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
IPC	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
JSON	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Locale	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
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Memoize	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Module	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Net	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Params	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Parse	[ DIR ]	drwxr-xr-x	2025-08-05 17:02
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Term	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Test	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Test2	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Text	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Thread	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
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Time	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
Unicode	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
User	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
autodie	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
encoding	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
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version	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
warnings	[ DIR ]	drwxr-xr-x	2026-06-26 06:22
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Benchmark.pm	30.3 KB	-rw-r--r--	2026-06-12 13:42
CORE.pod	3.11 KB	-rw-r--r--	2026-06-12 13:42
CPAN.pm	144.5 KB	-rw-r--r--	2026-06-12 13:42
Carp.pm	35.15 KB	-rw-r--r--	2026-06-12 13:42
DB.pm	18.48 KB	-rw-r--r--	2026-06-12 13:42
DBM_Filter.pm	14.05 KB	-rw-r--r--	2026-06-12 13:42
Digest.pm	10.96 KB	-rw-r--r--	2026-06-12 13:42
DirHandle.pm	2.04 KB	-rw-r--r--	2026-06-12 13:42
Dumpvalue.pm	17.25 KB	-rw-r--r--	2026-06-12 13:42
English.pm	4.65 KB	-rw-r--r--	2026-06-12 13:42
Env.pm	5.44 KB	-rw-r--r--	2026-06-12 13:42
Exporter.pm	18.76 KB	-rw-r--r--	2026-06-12 13:42
Fatal.pm	57.85 KB	-rw-r--r--	2026-06-12 13:42
FileCache.pm	5.42 KB	-rw-r--r--	2026-06-12 13:42
FileHandle.pm	6.65 KB	-rw-r--r--	2026-06-12 13:42
FindBin.pm	4.51 KB	-rw-r--r--	2026-06-12 13:42
Internals.pod	2.51 KB	-rw-r--r--	2026-06-12 13:42
Memoize.pm	31.82 KB	-rw-r--r--	2026-06-12 13:42
NEXT.pm	18.54 KB	-rw-r--r--	2026-06-12 13:42
PerlIO.pm	13.92 KB	-rw-r--r--	2026-06-12 13:42
Safe.pm	24.76 KB	-rw-r--r--	2026-06-12 13:42
SelectSaver.pm	1.05 KB	-rw-r--r--	2026-06-12 13:42
SelfLoader.pm	17.27 KB	-rw-r--r--	2026-06-12 13:42
Symbol.pm	4.79 KB	-rw-r--r--	2026-06-12 13:42
Test.pm	29.34 KB	-rw-r--r--	2026-06-12 13:42
Test2.pm	6.24 KB	-rw-r--r--	2026-06-12 13:42
Thread.pm	8.09 KB	-rw-r--r--	2026-06-12 13:42
UNIVERSAL.pm	6.67 KB	-rw-r--r--	2026-06-12 13:42
XSLoader.pm	11.13 KB	-rw-r--r--	2026-06-12 13:42
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autodie.pm	12.14 KB	-rw-r--r--	2026-06-12 13:42
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bigint.pm	22.7 KB	-rw-r--r--	2026-06-12 13:42
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bigrat.pm	20.64 KB	-rw-r--r--	2026-06-12 13:42
blib.pm	2.01 KB	-rw-r--r--	2026-06-12 13:42
builtin.pm	10.15 KB	-rw-r--r--	2026-06-12 13:42
bytes.pm	3.69 KB	-rw-r--r--	2026-06-12 13:42
bytes_heavy.pl	758 B	-rw-r--r--	2026-06-12 13:42
charnames.pm	20.56 KB	-rw-r--r--	2026-06-12 13:42
constant.pm	14.38 KB	-rw-r--r--	2026-06-12 13:42
deprecate.pm	4.92 KB	-rw-r--r--	2026-06-12 13:42
diagnostics.pm	18.88 KB	-rw-r--r--	2026-06-12 13:42
dumpvar.pl	15.19 KB	-rw-r--r--	2026-06-12 13:42
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feature.pm	53.32 KB	-rw-r--r--	2026-06-12 13:42
fields.pm	9.25 KB	-rw-r--r--	2026-06-12 13:42
filetest.pm	3.91 KB	-rw-r--r--	2026-06-12 13:42
if.pm	3.55 KB	-rw-r--r--	2026-06-12 13:42
integer.pm	3.18 KB	-rw-r--r--	2026-06-12 13:42
less.pm	3.13 KB	-rw-r--r--	2026-06-12 13:42
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parent.pm	2.64 KB	-rw-r--r--	2026-06-12 13:42
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perlfaq.pm	77 B	-rw-r--r--	2026-06-12 13:42
sigtrap.pm	8.53 KB	-rw-r--r--	2026-06-12 13:42
sort.pm	2.92 KB	-rw-r--r--	2026-06-12 13:42
stable.pm	4.55 KB	-rw-r--r--	2026-06-12 13:42
strict.pm	4.67 KB	-rw-r--r--	2026-06-12 13:42
subs.pm	945 B	-rw-r--r--	2026-06-12 13:42
utf8.pm	10.63 KB	-rw-r--r--	2026-06-12 13:42
vars.pm	2.4 KB	-rw-r--r--	2026-06-12 13:42
version.pm	1.93 KB	-rw-r--r--	2026-06-12 13:42
version.pod	9.6 KB	-rw-r--r--	2026-06-12 13:42
vmsish.pm	4.21 KB	-rw-r--r--	2026-06-12 13:42
warnings.pm	55.73 KB	-rw-r--r--	2026-06-12 13:42

Rename

package if;
use strict;
our $VERSION = '0.0610';

sub work {
  my $method = shift() ? 'import' : 'unimport';
  unless (@_ >= 2) {
    my $type = ($method eq 'import') ? 'use' : 'no';
    die "Too few arguments to '$type if' (some code returning an empty list in list context?)"
  }
  return unless shift;		# CONDITION

my $p = $_[0];		# PACKAGE
  (my $file = "$p.pm") =~ s!::!/!g;
  require $file;		# Works even if $_[0] is a keyword (like open)
  my $m = $p->can($method);
  goto &$m if $m;
}

sub import   { shift; unshift @_, 1; goto &work }
sub unimport { shift; unshift @_, 0; goto &work }

1;
__END__

=head1 NAME

if - C<use> a Perl module if a condition holds

=head1 SYNOPSIS

use if CONDITION, "MODULE", ARGUMENTS;
    no  if CONDITION, "MODULE", ARGUMENTS;

=head1 DESCRIPTION

=head2 C<use if>

The C<if> module is used to conditionally load another module.  The construct:

use if CONDITION, "MODULE", ARGUMENTS;

... will load C<MODULE> only if C<CONDITION> evaluates to true; it has no
effect if C<CONDITION> evaluates to false.  (The module name, assuming it
contains at least one C<::>, must be quoted when C<'use strict "subs";'> is in
effect.)  If the CONDITION does evaluate to true, then the above line has the
same effect as:

use MODULE ARGUMENTS;

For example, the F<Unicode::UCD> module's F<charinfo> function will use two functions from F<Unicode::Normalize> only if a certain condition is met:

use if defined &DynaLoader::boot_DynaLoader,
        "Unicode::Normalize" => qw(getCombinClass NFD);

Suppose you wanted C<ARGUMENTS> to be an empty list, I<i.e.>, to have the
effect of:

use MODULE ();

You can't do this with the C<if> pragma; however, you can achieve
exactly this effect, at compile time, with:

BEGIN { require MODULE if CONDITION }

=head2 C<no if>

The C<no if> construct is mainly used to deactivate categories of warnings
when those categories would produce superfluous output under specified
versions of F<perl>.

For example, the C<redundant> category of warnings was introduced in
Perl-5.22.  This warning flags certain instances of superfluous arguments to
C<printf> and C<sprintf>.  But if your code was running warnings-free on
earlier versions of F<perl> and you don't care about C<redundant> warnings in
more recent versions, you can call:

use warnings;
    no if $] >= 5.022, q|warnings|, qw(redundant);

my $test    = { fmt  => "%s", args => [ qw( x y ) ] };
    my $result  = sprintf $test->{fmt}, @{$test->{args}};

The C<no if> construct assumes that a module or pragma has correctly
implemented an C<unimport()> method -- but most modules and pragmata have not.
That explains why the C<no if> construct is of limited applicability.

=head1 BUGS

The current implementation does not allow specification of the required
version of the module.

=head1 SEE ALSO

L<Module::Requires> can be used to conditionally load one or more modules,
with constraints based on the version of the module.
Unlike C<if> though, L<Module::Requires> is not a core module.

L<Module::Load::Conditional> provides a number of functions you can use to
query what modules are available, and then load one or more of them at runtime.

The L<provide> module from CPAN can be used to select one of several possible
modules to load based on the version of Perl that is running.

=head1 AUTHOR

Ilya Zakharevich L<mailto:ilyaz@cpan.org>.

=head1 COPYRIGHT AND LICENCE

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut