Re: Sub-Classing HTML::Template v2.7

On Thu, 3 Mar 2005, Cory Trese wrote:

> My major questions are:
> 
> 1. How does a sub-class of HTML::Template construct itself?  Should I
> over-ride 'new( )' or use something like 'make_new( )' to wrap 'new( )'
> or 'SUPER::new( )'.

  package HTML::Template::Awesomer;
  use base 'HTML::Template';

  sub new {
     my $pkg = shift;
     my $self = $pkg->SUPER::new(@_);
     return $self;
  }

Of course you can insert your own code before and after the call to
SUPER::new() depending what you're trying to do.

> 2. What packages should my 'param( )' method be overridden in?  More
> than HTML::Template?

In your sub-class of course.  Something like:

  sub param {
     my $self = shift;
     $self->SUPER::param(@_);
  }

Of course you'll want to add code to implement your extension.

You should never have this line in a sub-class:

> package HTML::Template;

That's going to actually overwrite (not override) a subroutine in the
HTML::Template namespace.

Have you read Damian Conway's Object Oriented Perl book?  I highly
recommend it for anyone serious about doing OO in Perl.

-sam


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