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??
Your example is breaking encapsulation. That is, it is avoiding the accessor and reaching in to the internals. If we have the object:
package OOtest; sub new { my $invoker = shift; my $class = ref($invoker) || $invoker; my $self = {}; bless ($self, $class); $self->{list} = []; return $self; } sub get_array { my $self = shift; return $self->{list}; }
To access the array, use the accessor get_array and do not bypass it by delving in and directory accessing the private variable.
my $obj = OOtest->new(); # NOT foreach my $tmp ( @{ $obj->list() } foreach my $tmp ( @{ $obj->get_array() } ) { # process list }
Now, internally, you want to change OOtest to use a hash, but you do not want to break other code that expects it to use (and wants) an array. Behold the beauty of accessors, you merely change the get_array subroutine.
package OOtest; sub new { my $invoker = shift; my $class = ref($invoker) || $invoker; my $self = {}; bless ($self, $class); $self->{list} = (); return $self; } sub get_array { my $self = shift; return values %{$self->{list}}; # anything asking for an array gets + it }
enoch

In reply to Re: Why get() and set() accessor methods are evil by enoch
in thread Why get() and set() accessor methods are evil by synistar

Title:
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 How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (3)
As of 2022-12-05 08:11 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?