Description:

The 'Class::Adapter' class is intended as an abstract base class for
creating any sort of class or object that follows the _Adapter_ pattern.

What is an Adapter?
The term _Adapter_ refers to a _"Design Pattern"_ of the same name,
from the famous _"Gang of Four"_ book _"Design Patterns"_. Although
their original implementation was designed for Java and similar
single-inheritance strictly-typed langauge, the situation for which it
applies is still valid.

An _Adapter_ in this Perl sense of the term is when a class is created
to achieve by composition (objects containing other object) something
that can't be achieved by inheritance (sub-classing).