Here is a question.

How could we design a type of class to enable it to include the classes which is different but have something in common ?

The solution is sorrogate

After reading the chapter 0, 1 and 2 of << Reminations on C++ >>, I try to make myself more sober and do some summaries for this question.

Why should we use C++ ?

What I want to do is to give the answer in advance and then give the reason.

Here we go.

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