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Name	Size	Permission	Date
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Archive	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Attribute	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
B	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
CPAN	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Carp	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Class	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Compress	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Config	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
DBM_Filter	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Devel	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Digest	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Encode	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Exporter	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
ExtUtils	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
File	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Filter	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Getopt	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
HTTP	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
I18N	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
IO	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
IPC	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
JSON	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Locale	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Math	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Memoize	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Module	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Net	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Params	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Parse	[ DIR ]	drwxr-xr-x	2023-07-12 09:40
Perl	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
PerlIO	[ DIR ]	drwxr-xr-x	2023-07-12 09:40
Pod	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Search	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
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Term	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Test	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Test2	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Text	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Thread	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Tie	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Time	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
Unicode	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
User	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
autodie	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
encoding	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
overload	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
pod	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
unicore	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
version	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
warnings	[ DIR ]	drwxr-xr-x	2025-04-07 20:15
AnyDBM_File.pm	2.56 KB	-rw-r--r--	2023-11-25 20:59
AutoLoader.pm	15.43 KB	-rw-r--r--	2023-11-25 20:59
AutoSplit.pm	19.18 KB	-rw-r--r--	2023-11-25 20:59
Benchmark.pm	30.3 KB	-rw-r--r--	2023-11-25 20:59
CORE.pod	3.11 KB	-rw-r--r--	2023-11-25 20:59
CPAN.pm	144.5 KB	-rw-r--r--	2023-11-25 20:59
Carp.pm	35.14 KB	-rw-r--r--	2023-11-25 20:59
DB.pm	18.48 KB	-rw-r--r--	2023-11-25 20:59
DBM_Filter.pm	14.05 KB	-rw-r--r--	2023-11-25 20:59
Digest.pm	10.96 KB	-rw-r--r--	2023-11-25 20:59
DirHandle.pm	2.04 KB	-rw-r--r--	2023-11-25 20:59
Dumpvalue.pm	17.25 KB	-rw-r--r--	2023-11-25 20:59
English.pm	4.65 KB	-rw-r--r--	2023-11-25 20:59
Env.pm	5.44 KB	-rw-r--r--	2023-11-25 20:59
Exporter.pm	18.76 KB	-rw-r--r--	2023-11-25 20:59
Fatal.pm	57.7 KB	-rw-r--r--	2023-11-25 20:59
FileCache.pm	5.42 KB	-rw-r--r--	2023-11-25 20:59
FileHandle.pm	6.63 KB	-rw-r--r--	2023-11-25 20:59
FindBin.pm	4.51 KB	-rw-r--r--	2023-11-25 20:59
Internals.pod	2.51 KB	-rw-r--r--	2023-11-25 20:59
Memoize.pm	35.34 KB	-rw-r--r--	2023-11-25 20:59
NEXT.pm	18.54 KB	-rw-r--r--	2023-11-25 20:59
PerlIO.pm	13.92 KB	-rw-r--r--	2023-11-25 20:59
Safe.pm	24.76 KB	-rw-r--r--	2023-11-25 20:59
SelectSaver.pm	1.05 KB	-rw-r--r--	2023-11-25 20:59
SelfLoader.pm	17.27 KB	-rw-r--r--	2023-11-25 20:59
Symbol.pm	4.79 KB	-rw-r--r--	2023-11-25 20:59
Test.pm	29.34 KB	-rw-r--r--	2023-11-25 20:59
Test2.pm	6.24 KB	-rw-r--r--	2023-11-25 20:59
Thread.pm	8.09 KB	-rw-r--r--	2023-11-25 20:59
UNIVERSAL.pm	6.61 KB	-rw-r--r--	2023-11-25 20:59
XSLoader.pm	11.13 KB	-rw-r--r--	2023-11-25 20:59
_charnames.pm	34.84 KB	-rw-r--r--	2023-11-25 20:59
autodie.pm	12.14 KB	-rw-r--r--	2023-11-25 20:59
autouse.pm	4.14 KB	-rw-r--r--	2023-11-25 20:59
base.pm	10.7 KB	-rw-r--r--	2023-11-25 20:59
bigfloat.pm	21.45 KB	-rw-r--r--	2023-11-25 20:59
bigint.pm	22.7 KB	-rw-r--r--	2023-11-25 20:59
bignum.pm	27.56 KB	-rw-r--r--	2023-11-25 20:59
bigrat.pm	20.64 KB	-rw-r--r--	2023-11-25 20:59
blib.pm	2.01 KB	-rw-r--r--	2023-11-25 20:59
builtin.pm	8.84 KB	-rw-r--r--	2023-11-25 20:59
bytes.pm	3.69 KB	-rw-r--r--	2023-11-25 20:59
bytes_heavy.pl	758 B	-rw-r--r--	2023-11-25 20:59
charnames.pm	20.56 KB	-rw-r--r--	2023-11-25 20:59
constant.pm	14.38 KB	-rw-r--r--	2023-11-25 20:59
deprecate.pm	4.92 KB	-rw-r--r--	2023-11-25 20:59
diagnostics.pm	18.88 KB	-rw-r--r--	2023-11-25 20:59
dumpvar.pl	15.19 KB	-rw-r--r--	2023-11-25 20:59
experimental.pm	8.12 KB	-rw-r--r--	2023-11-25 20:59
feature.pm	51.6 KB	-rw-r--r--	2023-11-25 20:59
fields.pm	9.25 KB	-rw-r--r--	2023-11-25 20:59
filetest.pm	3.91 KB	-rw-r--r--	2023-11-25 20:59
if.pm	3.55 KB	-rw-r--r--	2023-11-25 20:59
integer.pm	3.18 KB	-rw-r--r--	2023-11-25 20:59
less.pm	3.13 KB	-rw-r--r--	2023-11-25 20:59
locale.pm	4.77 KB	-rw-r--r--	2023-11-25 20:59
meta_notation.pm	2.02 KB	-rw-r--r--	2023-11-25 20:59
ok.pm	967 B	-rw-r--r--	2023-11-25 20:59
open.pm	8.3 KB	-rw-r--r--	2023-11-25 20:59
overload.pm	52.22 KB	-rw-r--r--	2023-11-25 20:59
overloading.pm	1.77 KB	-rw-r--r--	2023-11-25 20:59
parent.pm	2.64 KB	-rw-r--r--	2023-11-25 20:59
perl5db.pl	310.05 KB	-rw-r--r--	2023-11-25 20:59
perlfaq.pm	77 B	-rw-r--r--	2023-11-25 20:59
sigtrap.pm	8.53 KB	-rw-r--r--	2023-11-25 20:59
sort.pm	2.92 KB	-rw-r--r--	2023-11-25 20:59
strict.pm	4.67 KB	-rw-r--r--	2023-11-25 20:59
subs.pm	945 B	-rw-r--r--	2023-11-25 20:59
utf8.pm	10.5 KB	-rw-r--r--	2023-11-25 20:59
vars.pm	2.4 KB	-rw-r--r--	2023-11-25 20:59
version.pm	1.93 KB	-rw-r--r--	2023-11-25 20:59
version.pod	9.6 KB	-rw-r--r--	2023-11-25 20:59
vmsish.pm	4.21 KB	-rw-r--r--	2023-11-25 20:59
warnings.pm	54.61 KB	-rw-r--r--	2023-11-25 20:59

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