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|
#!./perl
use strict;
use Config;
BEGIN {
unless (-d 'blib') {
chdir 't' if -d 't';
@INC = '../lib';
keys %Config; # Silence warning
if ($Config{extensions} !~ /\bList\/Util\b/) {
print "1..0 # Skip: List::Util was not built\n";
exit 0;
}
}
}
use Scalar::Util ();
use Test::More ((grep { /weaken/ } @Scalar::Util::EXPORT_FAIL) and !$ENV{PERL_CORE})
? (skip_all => 'weaken requires XS version')
: (tests => 22);
if (0) {
require Devel::Peek;
Devel::Peek->import('Dump');
}
else {
*Dump = sub {};
}
Scalar::Util->import(qw(weaken isweak));
if(1) {
my ($y,$z);
#
# Case 1: two references, one is weakened, the other is then undef'ed.
#
{
my $x = "foo";
$y = \$x;
$z = \$x;
}
print "# START\n";
Dump($y); Dump($z);
ok( ref($y) and ref($z));
print "# WEAK:\n";
weaken($y);
Dump($y); Dump($z);
ok( ref($y) and ref($z));
print "# UNDZ:\n";
undef($z);
Dump($y); Dump($z);
ok( not (defined($y) and defined($z)) );
print "# UNDY:\n";
undef($y);
Dump($y); Dump($z);
ok( not (defined($y) and defined($z)) );
print "# FIN:\n";
Dump($y); Dump($z);
#
# Case 2: one reference, which is weakened
#
print "# CASE 2:\n";
{
my $x = "foo";
$y = \$x;
}
ok( ref($y) );
print "# BW: \n";
Dump($y);
weaken($y);
print "# AW: \n";
Dump($y);
ok( not defined $y );
print "# EXITBLOCK\n";
}
#
# Case 3: a circular structure
#
my $flag = 0;
{
my $y = bless {}, 'Dest';
Dump($y);
print "# 1: $y\n";
$y->{Self} = $y;
Dump($y);
print "# 2: $y\n";
$y->{Flag} = \$flag;
print "# 3: $y\n";
weaken($y->{Self});
print "# WKED\n";
ok( ref($y) );
print "# VALS: HASH ",$y," SELF ",\$y->{Self}," Y ",\$y,
" FLAG: ",\$y->{Flag},"\n";
print "# VPRINT\n";
}
print "# OUT $flag\n";
ok( $flag == 1 );
print "# AFTER\n";
undef $flag;
print "# FLAGU\n";
#
# Case 4: a more complicated circular structure
#
$flag = 0;
{
my $y = bless {}, 'Dest';
my $x = bless {}, 'Dest';
$x->{Ref} = $y;
$y->{Ref} = $x;
$x->{Flag} = \$flag;
$y->{Flag} = \$flag;
weaken($x->{Ref});
}
ok( $flag == 2 );
#
# Case 5: deleting a weakref before the other one
#
my ($y,$z);
{
my $x = "foo";
$y = \$x;
$z = \$x;
}
print "# CASE5\n";
Dump($y);
weaken($y);
Dump($y);
undef($y);
ok( not defined $y);
ok( ref($z) );
#
# Case 6: test isweakref
#
$a = 5;
ok(!isweak($a));
$b = \$a;
ok(!isweak($b));
weaken($b);
ok(isweak($b));
$b = \$a;
ok(!isweak($b));
my $x = {};
weaken($x->{Y} = \$a);
ok(isweak($x->{Y}));
ok(!isweak($x->{Z}));
#
# Case 7: test weaken on a read only ref
#
SKIP: {
# Doesn't work for older perls, see bug [perl #24506]
skip("Test does not work with perl < 5.8.3", 5) if $] < 5.008003;
# in a MAD build, constants have refcnt 2, not 1
skip("Test does not work with MAD", 5) if exists $Config{mad};
$a = eval '\"hello"';
ok(ref($a)) or print "# didn't get a ref from eval\n";
$b = $a;
eval{weaken($b)};
# we didn't die
ok($@ eq "") or print "# died with $@\n";
ok(isweak($b));
ok($$b eq "hello") or print "# b is '$$b'\n";
$a="";
ok(not $b) or print "# b didn't go away\n";
}
package Dest;
sub DESTROY {
print "# INCFLAG\n";
${$_[0]{Flag}} ++;
}
|
