Chapter 14, The Template Method Pattern and the 
Non-Virtual Idiom

1. A behavioral pattern describes a way to solve a common problem by using a specific method to communicate between different objects.
2. The template method pattern is a standard way to implement an algorithm that has a rigid skeleton, or the overall flow of control, but allows for one or more customization points for specific kinds of problems.
3. The Template Method lets the sub-classes (derived types) implement specific behaviors of the otherwise generic algorithm. The key to this pattern is the way the base and the derived types interact.
4. The more common hierarchical approach to design sees the low-level code provide building blocks from which the high-level code builds the specific algorithm, by combining them in a particular flow of control. In the template pattern, the high-level code does not determine the overall algorithm and is not in control of the overall flow. The lower-level code controls...