Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
The following snippet is taken from that example I alluded to above.
# This exists to provide object-specific can() functionality. # 1) If this is an object, check to see if the method is an element na +me. # 2) If either is not true, redispatch to the parent's can() method. + sub can { ( ref($_[0]) && UNIVERSAL::isa( $_[0]->elements, 'HASH' ) && exists $_[0]->elements->{$_[1]} ) || ( $_[0]->SUPER::can($_[1]) ); } sub AUTOLOAD { (my $name = our $AUTOLOAD) =~ s/.*::([^:]+)$/$1/; my $self = shift; unless ($name eq lc $name || exists $self->element_classes->{lc $n +ame}) { return eval "$self->SUPER::$meth(@_);"; } $self->elements->{$name} = shift if @_; $self->elements->{$name}; }

A few notes:

  1. This is a container object, providing a unified interface to parsing stuff. It acts as a record and the elements are the various columns. Each record may have different columns and the goal was to provide a way of allowing the user to call the column name as a method and get the column object.
  2. element_classes is a method which returns a hashref of name-class pairs. The name is the name of the column as provided to this object in the constructor. The class is the class of the column.
  3. elements is a hashref which actually contains the column objects in name-object pairs. It is guaranteed that the names from element_classes() will be identical to the names from elements().

This implementation has the added benefit of the fact that it's currently working in production. Now, nothing inherits from it (yet) and I do not use MI in production code, for the reasons well-cited elsewhere.

------
We are the carpenters and bricklayers of the Information Age.

Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose


In reply to Re: Re: Re: Why breaking can() is acceptable by dragonchild
in thread Why breaking can() is acceptable by tilly

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?Last hourOther CB clients
Other Users?
Others admiring the Monastery: (6)
As of 2024-04-19 08:39 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found