Okay, let’s now take a look at how
Object Oriented Design is implemented in Perl 5.
Fortunately the implementation is much easier to get
than the theory.
In Perl 5, as in most other OOP
languages, the basic unit of encapsulation is the
object.
Each Perl 5 object is described by
a class that defines its methods (Perl subroutines) and
fields (regular Perl variables). Classes
may be inherited from and instantiated.
Instantiated objects in Perl are
simply references that have knowledge of which class
they belong to.
Since object methods are simply
Perl subroutines, polymorphism can be handled by
discerning what type of information is passed to
the subroutine.
Let's look at the innards though. it
will be more clear when we can see how this thing
actually works
