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#line 1
# Scalar::Util.pm
#
# 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.
package Scalar::Util;
use strict;
use vars qw(@ISA @EXPORT_OK $VERSION @EXPORT_FAIL);
require Exporter;
require List::Util; # List::Util loads the XS
@ISA = qw(Exporter);
@EXPORT_OK = qw(blessed dualvar reftype weaken isweak tainted readonly openhandle refaddr isvstring looks_like_number set_prototype);
$VERSION = "1.23";
$VERSION = eval $VERSION;
unless (defined &dualvar) {
# Load Pure Perl version if XS not loaded
require Scalar::Util::PP;
Scalar::Util::PP->import;
push @EXPORT_FAIL, qw(weaken isweak dualvar isvstring set_prototype);
}
sub export_fail {
if (grep { /dualvar/ } @EXPORT_FAIL) { # no XS loaded
my $pat = join("|", @EXPORT_FAIL);
if (my ($err) = grep { /^($pat)$/ } @_ ) {
require Carp;
Carp::croak("$err is only available with the XS version of Scalar::Util");
}
}
if (grep { /^(weaken|isweak)$/ } @_ ) {
require Carp;
Carp::croak("Weak references are not implemented in the version of perl");
}
if (grep { /^(isvstring)$/ } @_ ) {
require Carp;
Carp::croak("Vstrings are not implemented in the version of perl");
}
@_;
}
sub openhandle ($) {
my $fh = shift;
my $rt = reftype($fh) || '';
return defined(fileno($fh)) ? $fh : undef
if $rt eq 'IO';
if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA)
$fh = \(my $tmp=$fh);
}
elsif ($rt ne 'GLOB') {
return undef;
}
(tied(*$fh) or defined(fileno($fh)))
? $fh : undef;
}
1;
__END__
#line 283
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