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Thinking in C++
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Automatic destructor calls

Although you are often required to make explicit constructor calls in the initializer list, you never need to make explicit destructor calls because there’s only one destructor for any class, and it doesn’t take any arguments. However, the compiler still ensures that all destructors are called, and that means all of the destructors in the entire hierarchy, starting with the most-derived destructor and working back to the root.

It’s worth emphasizing that constructors and destructors are quite unusual in that every one in the hierarchy is called, whereas with a normal member function only that function is called, but not any of the base-class versions. If you also want to call the base-class version of a normal member function that you’re overriding, you must do it explicitly.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire