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# Copyright (c) 1997-2007 Graham Barr <gbarr@pobox.com>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
#
# Maintained since 2013 by Paul Evans <leonerd@leonerd.org.uk>
package Scalar::Util;
use strict;
use warnings;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(
blessed refaddr reftype weaken unweaken isweak
dualvar isdual isvstring looks_like_number openhandle readonly set_prototype
tainted
);
our $VERSION = "1.46_02";
$VERSION = eval $VERSION;
require List::Util; # List::Util loads the XS
List::Util->VERSION( $VERSION ); # Ensure we got the right XS version (RT#100863)
our @EXPORT_FAIL;
unless (defined &weaken) {
push @EXPORT_FAIL, qw(weaken);
}
unless (defined &isweak) {
push @EXPORT_FAIL, qw(isweak isvstring);
}
unless (defined &isvstring) {
push @EXPORT_FAIL, qw(isvstring);
}
sub export_fail {
if (grep { /^(?:weaken|isweak)$/ } @_ ) {
require Carp;
Carp::croak("Weak references are not implemented in the version of perl");
}
if (grep { /^isvstring$/ } @_ ) {
require Carp;
Carp::croak("Vstrings are not implemented in the version of perl");
}
@_;
}
# set_prototype has been moved to Sub::Util with a different interface
sub set_prototype(&$)
{
my ( $code, $proto ) = @_;
return Sub::Util::set_prototype( $proto, $code );
}
1;
__END__
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