During the course of this series we have written a tokenizer, designed a grammar, implemented the grammar in a recursive descent parser and built an expression tree that corresponds to the mathematical expression and that is able to calculate a…
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The observer design pattern is a classic design pattern that lets objects, called observables, notify a number of dependant objects, called observers, when a change of the observable’s state occurs. This is often used in distributed event handling systems and…
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The visitor design pattern is one of the classic software design patterns. It solves the problem of calling different functions for each objects of different types in a polymorphic collection. Imagine a type hierarchy. class Base; class DerivedA : public…
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