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":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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
    Domain Nodelet?
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this?Last hourOther CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (5)
    As of 2024-09-11 22:52 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      The PerlMonks site front end has:





      Results (15 votes). Check out past polls.

      Notices?
      erzuuli‥ 🛈The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.