source: vendor/perl/5.8.8/ext/Storable/t/dclone.t@ 3181

#!./perl
#
#  Copyright (c) 1995-2000, Raphael Manfredi
#  
#  You may redistribute only under the same terms as Perl 5, as specified
#  in the README file that comes with the distribution.
#

sub BEGIN {
    if ($ENV{PERL_CORE}){
        chdir('t') if -d 't';
        @INC = ('.', '../lib', '../ext/Storable/t');
    } else {
        unshift @INC, 't';
    }
    require Config; import Config;
    if ($ENV{PERL_CORE} and $Config{'extensions'} !~ /\bStorable\b/) {
        print "1..0 # Skip: Storable was not built\n";
        exit 0;
    }
    require 'st-dump.pl';
}


use Storable qw(dclone);

print "1..10\n";

$a = 'toto';
$b = \$a;
$c = bless {}, CLASS;
$c->{attribute} = 'attrval';
%a = ('key', 'value', 1, 0, $a, $b, 'cvar', \$c);
@a = ('first', undef, 3, -4, -3.14159, 456, 4.5,
        $b, \$a, $a, $c, \$c, \%a);

print "not " unless defined ($aref = dclone(\@a));
print "ok 1\n";

$dumped = &dump(\@a);
print "ok 2\n";

$got = &dump($aref);
print "ok 3\n";

print "not " unless $got eq $dumped; 
print "ok 4\n";

package FOO; @ISA = qw(Storable);

sub make {
        my $self = bless {};
        $self->{key} = \%main::a;
        return $self;
};

package main;

$foo = FOO->make;
print "not " unless defined($r = $foo->dclone);
print "ok 5\n";

print "not " unless &dump($foo) eq &dump($r);
print "ok 6\n";

# Ensure refs to "undef" values are properly shared during cloning
my $hash;
push @{$$hash{''}}, \$$hash{a};
print "not " unless $$hash{''}[0] == \$$hash{a};
print "ok 7\n";

my $cloned = dclone(dclone($hash));
print "not " unless $$cloned{''}[0] == \$$cloned{a};
print "ok 8\n";

$$cloned{a} = "blah";
print "not " unless $$cloned{''}[0] == \$$cloned{a};
print "ok 9\n";

# [ID 20020221.007] SEGV in Storable with empty string scalar object
package TestString;
sub new {
    my ($type, $string) = @_;
    return bless(\$string, $type);
}
package main;
my $empty_string_obj = TestString->new('');
my $clone = dclone($empty_string_obj);
# If still here after the dclone the fix (#17543) worked.
print ref $clone eq ref $empty_string_obj &&
      $$clone eq $$empty_string_obj &&
      $$clone eq '' ? "ok 10\n" : "not ok 10\n";