[Israel.pm] Objects and classes

[semuel]

Hello There.

In mod_perl_2, there is an Apache::RequestRec object, that basically holds
the request and the response, And have a really few methods.
And there are other classes, like Apache::RequestIO, that expand that
functionality. In this case, it add methods like "content_type" and "print",
that let you print out the response, using:
$r->content_type('plain/html');
Where $r is of Apache::RequestRec.

The question is: have you seen other cases of classes that do something
similar?

It's like plating a method inside other object. Is this style is popular?

Semuel.