From the course: Object-Oriented Programming with C++

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Virtual destructors: Why, when, and how

Virtual destructors: Why, when, and how - C++ Tutorial

From the course: Object-Oriented Programming with C++

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Virtual destructors: Why, when, and how

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- Let's enhance our review system to handle a new requirement. We want to ensure all reviews include a sentiment analysis, a more detailed way of evaluating content beyond just the rating. However, we don't want to provide a default implementation because each specific review subclass uses a different sentiment analysis algorithm. So let's modify our review class to include this requirement. So I'll add a new public function virtual and it returns a float. Let's call it analyze sentiment. And I'll include the sentiment score in the output of the display details function. So this is the sentiment score and the value returned by analyzeSentiment. Now if I switch back to the header file, you'll notice this new syntax, the equal zero after the analyzeSentiment declaration. This makes it a pure virtual function, a function without implementation. Pure virtual functions serve a single purpose. Define a function requirement that derived classes must implement. Declaring a pure virtual…

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