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# Scalar::Util.pm |
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# |
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# Copyright (c) 1997-2007 Graham Barr . 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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package Scalar::Util; |
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use strict; |
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require Exporter; |
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require List::Util; # List::Util loads the XS |
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our @ISA = qw(Exporter); |
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our @EXPORT_OK = qw(blessed dualvar reftype weaken isweak tainted readonly openhandle refaddr isvstring looks_like_number set_prototype); |
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our $VERSION = "1.25"; |
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$VERSION = eval $VERSION; |
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our @EXPORT_FAIL; |
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unless (defined &weaken) { |
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push @EXPORT_FAIL, qw(weaken); |
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} |
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unless (defined &isweak) { |
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push @EXPORT_FAIL, qw(isweak isvstring); |
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} |
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unless (defined &isvstring) { |
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push @EXPORT_FAIL, qw(isvstring); |
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} |
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sub export_fail { |
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if (grep { /^(?:weaken|isweak)$/ } @_ ) { |
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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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1; |
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__END__ |