Guiding Principle---

[mmulvahill]

In DonaldKnuth's paper "StructuredProgrammingWithGoToStatements", he wrote:

"Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%

Write program as abstract classes with virtual methods. Afterward consider static polymorphism through template classes and CRTP (curiously recursive template pattern).