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Data	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Devel	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Digest	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Encode	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Exporter	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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File	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Filter	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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Regexp	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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Thread	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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autodie	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
encoding	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
overload	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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threads	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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version	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
warnings	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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DynaLoader.pm	25.4 KB	-rw-rw-rw-	2021-01-24 16:01
Encode.pm	31.33 KB	-rw-rw-rw-	2020-12-02 03:28
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IO.pm	1.42 KB	-rw-rw-rw-	2021-01-05 00:24
Internals.pod	2.51 KB	-rw-rw-rw-	2020-12-18 11:58
Memoize.pm	35.34 KB	-rw-rw-rw-	2020-12-18 11:58
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POSIX.pm	19.87 KB	-rw-rw-rw-	2020-12-18 12:04
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SelfLoader.pm	17.27 KB	-rw-rw-rw-	2020-12-18 11:58
Socket.pm	36.16 KB	-rw-rw-rw-	2021-01-05 17:48
Storable.pm	48.75 KB	-rw-rw-rw-	2020-12-18 12:04
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Test2.pm	6.24 KB	-rw-rw-rw-	2020-10-22 07:10
Thread.pm	8.09 KB	-rw-rw-rw-	2020-12-18 11:58
UNIVERSAL.pm	6.44 KB	-rw-rw-rw-	2020-12-18 11:58
URI.pm	33.95 KB	-rw-rw-rw-	2021-01-14 18:01
Win32.pm	57.28 KB	-rw-rw-rw-	2020-03-28 07:37
Win32CORE.pm	1.27 KB	-rw-rw-rw-	2020-12-18 11:58
XSLoader.pm	11.37 KB	-rw-rw-rw-	2021-01-24 16:07
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attributes.pm	15.97 KB	-rw-rw-rw-	2020-12-18 11:58
autodie.pm	12.14 KB	-rw-rw-rw-	2021-01-22 19:03
autouse.pm	4.14 KB	-rw-rw-rw-	2020-12-18 11:58
base.pm	10.7 KB	-rw-rw-rw-	2020-12-18 11:58
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bytes.pm	3.65 KB	-rw-rw-rw-	2020-12-18 12:04
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charnames.pm	20.44 KB	-rw-rw-rw-	2020-12-18 11:58
constant.pm	14.38 KB	-rw-rw-rw-	2020-12-18 11:58
cpanfile-faq.pod	4.39 KB	-rw-rw-rw-	2018-04-26 13:07
cpanfile.pod	3.39 KB	-rw-rw-rw-	2018-04-26 13:07
deprecate.pm	4.5 KB	-rw-rw-rw-	2020-12-18 11:58
diagnostics.pm	18.85 KB	-rw-rw-rw-	2020-12-18 11:58
dumpvar.pl	15.19 KB	-rw-rw-rw-	2020-12-18 11:58
encoding.pm	22.41 KB	-rw-rw-rw-	2020-12-18 11:57
experimental.pm	7.39 KB	-rw-rw-rw-	2020-05-05 00:34
feature.pm	18.56 KB	-rw-rw-rw-	2020-12-18 12:04
fields.pm	9.25 KB	-rw-rw-rw-	2020-12-18 11:58
filetest.pm	3.91 KB	-rw-rw-rw-	2020-12-18 11:58
if.pm	3.53 KB	-rw-rw-rw-	2020-12-18 12:04
integer.pm	3.18 KB	-rw-rw-rw-	2020-12-18 11:58
less.pm	3.13 KB	-rw-rw-rw-	2020-12-18 11:58
lib.pm	6.2 KB	-rw-rw-rw-	2021-01-24 16:01
locale.pm	4.74 KB	-rw-rw-rw-	2020-12-18 12:04
meta_notation.pm	2.07 KB	-rw-rw-rw-	2020-12-18 11:58
mro.pm	9.66 KB	-rw-rw-rw-	2020-12-18 12:04
newgetopt.pl	2.15 KB	-rw-rw-rw-	2010-07-09 16:26
ok.pm	967 B	-rw-rw-rw-	2020-10-22 07:10
open.pm	8.31 KB	-rw-rw-rw-	2020-12-18 11:58
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overload.pm	52.05 KB	-rw-rw-rw-	2020-12-18 12:04
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parent.pm	2.64 KB	-rw-rw-rw-	2020-12-18 11:58
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subs.pm	901 B	-rw-rw-rw-	2020-12-18 12:04
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vmsish.pm	4.21 KB	-rw-rw-rw-	2020-12-18 11:58
warnings.pm	49.35 KB	-rw-rw-rw-	2020-12-18 12:04

Rename

package if;

$VERSION = '0.0608';

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 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