Chapter 31. The Template Method Pattern
The Template Method pattern is a very simple pattern that you will find yourself using frequently. Whenever you write a parent class where you leave one or more of the methods to be implemented by derived classes, you are in essence using the Template pattern. The Template pattern formalizes the idea of defining an algorithm in a class but leaving some of the details to be implemented in subclasses. In other words, if your base class is an abstract class, as often happens in these design patterns, you are using a simple form of the Template pattern.
Since inheritance is a critical part of this pattern, we will develop our Template Method example exclusively in VB7.
Templates are so fundamental, you ...