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