Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Here's an exercise in fun OOP that's fairly unnecessary, but just in case you REALLY want objects :)
package LinkedList; use strict; my $HEAD_NODE = undef; # use a global var to get the head node sub new { my $this = shift; my $class = ref($this) || $this; my $self = {}; $self->{_ID} = shift || "Id"; $self->{_NAME} = shift || "Default"; $HEAD_NODE = $self unless defined $HEAD_NODE; $self->{_NEXT} = $HEAD_NODE; bless $self, $class; } sub name { my $self = shift; $self->{_NAME} = shift if @_; return $self->{_NAME}; } sub id { my $self = shift; $self->{_ID} = shift if @_; return $self->{_ID}; } # this really should handle references to objects, and not # the object itself... sub add_node { my $self = shift; my $node_to_add = shift; $self->{_NEXT} = $node_to_add; } # this really should handle references to objects, and not # the object itself... sub next { my $self = shift; return $self->{_NEXT}; } # may not be necessary DESTROY { my $self = shift; $self->{_NEXT} = undef; } 1; ---- #!/usr/bin/perl use strict; use LinkedList; my $first_node = LinkedList->new( 1, "data" ); my $second_node = LinkedList->new( 2, "more data"); my $third_node = LinkedList->new(3, "even more data"); $first_node->add_node( $second_node ); $second_node->add_node( $third_node ); my $node = $first_node; for ( my $i = 0; $i < 100; $i++ ) { print $node->id." ".$node->name."\n"; $i++; $node = $node->next; }
Update: A note from perlobj:
In the meantime, the best solution is to create a non-
recursive container class that holds a pointer to the self-
referential data structure. Define a DESTROY method for 
the containing object's class that manually breaks the 
circularities in the self-referential structure.
So maybe instead, call the above package (class) LinkedListNode and have a container LinkedList, just to be safe.

In reply to Re: OOP/Linked List Question by RazorbladeBidet
in thread OOP/Linked List Question by hok_si_la

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others scrutinizing the Monastery: (16)
    As of 2015-07-30 15:49 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (272 votes), past polls