Use the Template Design Pattern to Customize a Base Class Service in a Derived Class

n classic object-oriented design, a base class defines an interface in the form of public virtual member functions. A derived class may either override these functions or use them as-is. Often, this "all or nothing" policy is too coarse. What you really need is a more flexible design that allows a subclass to customize the functionality of a base class's service without overriding it entirely. This article shows how to use the Template design pattern to achieve such flexibility.

How can a subclass redefine certain steps of an algorithm without changing the algorithm's structure?

Use the Template design pattern.

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