C++ FAQ Celebrating Twenty-One Years of the C++ FAQ!!!
(Click here for a personal note from Marshall Cline.)
Section 24:
24.1 How do you express "private inheritance"?
24.2 How are "private inheritance" and "composition" similar?
24.3 Which should I prefer: composition or private inheritance?
24.4 Should I pointer-cast from a private derived class to its base class?
24.5 How is protected inheritance related to private inheritance?
24.6 What are the access rules with private and protected inheritance?
[24.1] How do you express "private inheritance"?

When you use : private instead of : public. E.g., 

class Foo : private Bar {
public:
  ...
};