Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
In 25 years of programming I have never actually run into a case where an element needed to know its container and also belong to multiple containers. *shrug*

In most cases I’ve had where the element knew about its container, it was created and owned by the container, so there was no way to create it independent from the container, and the container was free to choose whether the element would be persistent using weak references, or temporary and only held by the strong reference given to the caller when they retrieve the object.

If you have a sub X that needs to know about 2 objects, A and B, and A seems like a logical “container” and B seems like a thing that ought to be contained, then I would make A’s “get_B” return a temporary object C which holds strong references to A and B and has X as one of its methods.

package A; use Moo; has ‘b_set’, is => ‘rw’; sub get_b($self, $name) { return C->new(a => $self, b => $self->b_set->{$name}); } package B; use Moo; sub do_thing_with_a($self, $a) { … } package C; use Moo; has ‘a’, is => ‘ro’; has ‘b’, is => ‘ro’, handles => [qw( … )]; # all of b’s methods sub do_thing($self) { $self->b->do_thing_with_a($self->a); }

In reply to Re^2: OO Pattern Container x Elements and Method Chaining (House, Person, Inhabitant) by NERDVANA
in thread OO Pattern Container x Elements and Method Chaining by LanX

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

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

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

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (5)
As of 2022-01-19 11:38 GMT
Find Nodes?
    Voting Booth?
    In 2022, my preferred method to securely store passwords is:

    Results (55 votes). Check out past polls.