Imitate Sealed Classes and Disable Object Copying

he keywords final and sealed in Java and C# respectively ensure that a certain class shall not be subclassed. C++ doesn't have a similar keyword. Naive programmers are often tempted to derive from classes such as std::string and std::vector, which clearly weren't meant to be used as base classes. These illicit derivations can cause undefined behavior. Find out how to implement a compile-time constraint that blocks subclassing—plus, a technique for blocking object copying.

How can you disable inheritance from a class that isn't meant to be derived from? How do you prevent the copying of objects that aren't meant to be copied?

Restrict the access of your special member functions.

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