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Is there a difference between:
struct B {...};
struct D : B {...};
and:
struct B {...};
struct D : public B {...};
If no, why everyone, including the standard, using more verbose, 2nd variant?
No, the two are exactly the same. And I am not sure everyone uses the second variant. I don’t, for instance. Neither does the standard use it everywhere. For example, in C++11 §3.8, we see this:
On the other hand, being explicit means that people who don’t know the rules can understand the code.