my $method = shift() ?
'import' : 'unimport';
die "Too few arguments to `use if' (some code returning an empty list in list context?)"
return unless shift; # CONDITION
(my $file = "$p.pm") =~ s!::!/!g;
require $file; # Works even if $_[0] is a keyword (like open)
my $m = $p->can($method);
sub import
{ shift; unshift @_, 1; goto &work
}
sub unimport
{ shift; unshift @_, 0; goto &work
}
if - C<use> a Perl module if a condition holds
use if CONDITION, MODULE => ARGUMENTS;
use if CONDITION, MODULE => ARGUMENTS;
has no effect unless C<CONDITION> is true. In this case the effect is
Above C<< => >> provides necessary quoting of C<MODULE>. If not used (e.g.,
no ARGUMENTS to give), you'd better quote C<MODULE> yourselves.
The current implementation does not allow specification of the
required version of the module.
Ilya Zakharevich L<mailto:perl-module-if@ilyaz.org>.