Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

One option would be a simplistic factory that held a single "shared thing", and was responsible for creating the other objects, so that they could have a reference to the shared thing without having to explicitly pass the "shared thing" around.

Something like this:

#!/usr/bin/perl -w use strict; package SharedThing; sub new { my $that = shift; my $class = ref($that) || $that; return bless {"counter" => 0}, ref($that) || $that; } sub hello { my $this=shift; $this->{counter}++; printf "hello, count is [%d]\n",$this->{counter}; } package MyFactory; sub new { my $that = shift; my $class = ref($that) || $that; my $this = {}; bless $this, $class; $this->{sharedthing}=SharedThing->new(); return $this; } sub A {A->new(@_);} sub B {B->new(@_);} package A; sub new { my $that = shift; my $class = ref($that) || $that; my $this = {}; bless $this, $class; $this->{factory}=shift; # call the "hello" method of the "shared thing" so that # we can see that it's indeed a single instance $this->{factory}->{sharedthing}->hello(); return $this; } package B; our @ISA=qw(A); package main; my $factory=MyFactory->new(); my $a1=$factory->A(); my $a2=$factory->A(); my $b1=$factory->B(); my $b2=$factory->B();

All of the instances of A and B have a reference to the factory passed to them when they are instantiated, and so, they can get to $this->{factory}->{sharedthing}...the single shared object.


In reply to Re: Access to single object from multiple other objects by kschwab
in thread Access to single object from multiple other objects by elTriberium

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
  • Outside of code tags, you may need to use entities for some characters:
            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 about the Monastery: (3)
    As of 2014-07-30 22:55 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (241 votes), past polls