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DESTROY Obj=HASH(0x81813f4) at /tmp/a.pl line 54.
DESTROY Obj2=HASH(0x8132fdc) at /tmp/a.pl line 101 during global destruction.
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#!/usr/bin/perl
{
package Obj;
my $next_id = 0;
our %linklist;
sub new {
my($class, $label, $prev, $next) = @_;
my $id = $next_id++;
my $prev_id = $prev->{id};
my $next_id = $next->{id};
my $self = bless {
id => $id,
label => $label,
prev => $prev_id,
next => $next_id,
}, $class;
$prev->{next} = $id;
$next->{prev} = $id;
$linklist{$id} = $self;
$self;
}
sub next {
my $self = shift;
if (defined $self->{next}) {
$linklist{$self->{next}};
}
}
sub prev {
my $self = shift;
if (defined $self->{prev}) {
$linklist{$self->{prev}};
}
}
sub traverse_forward {
my($self) = @_;
print $self->{label};
while(defined $self->{next}) {
$self = $linklist{$self->{next}};
print " " . $self->{label};
}
print "\n";
}
sub traverse_backward {
my($self) = @_;
print $self->{label};
while(defined $self->{prev}) {
$self = $linklist{$self->{prev}};
print " " . $self->{label};
}
print "\n";
}
sub DESTROY {
warn "DESTROY @_";
}
}
{
package Obj2;
use Scalar::Util qw(weaken);
sub new {
my($class, $label, $prev, $next) = @_;
my $self = bless {
label => $label,
prev => $prev,
next => $next,
}, $class;
$prev->{next} = $self;
$next->{prev} = $self;
# weaken $self->{prev} if $self->{prev}; # Hier!
# weaken $next->{prev} if $next->{prev}; # Hier!
$self;
}
sub next {
my $self = shift;
$self->{next};
}
sub prev {
my $self = shift;
$self->{prev};
}
sub traverse_forward {
my($self) = @_;
print $self->{label};
while(defined $self->{next}) {
$self = $self->{next};
print " " . $self->{label};
}
print "\n";
}
sub traverse_backward {
my($self) = @_;
print $self->{label};
while(defined $self->{prev}) {
$self = $self->{prev};
print " " . $self->{label};
}
print "\n";
}
sub DESTROY {
warn "DESTROY @_";
}
}
{
my $x1 = Obj->new("Null", undef, undef);
my $x2 = Obj->new("Eins", $x1, undef);
my $x3 = Obj->new("Zwei", $x2, undef);
$x1->traverse_forward;
$x3->traverse_backward;
%Obj::linklist = ();
}
{
my $x1 = Obj2->new("Null", undef, undef);
my $x2 = Obj2->new("Eins", $x1, undef);
my $x3 = Obj2->new("Zwei", $x2, undef);
$x1->traverse_forward;
$x3->traverse_backward;
}
|< 1 2 3 4 >| | 32 Einträge, 4 Seiten |