Unlike some other object-oriented languages, C++ lets a class have more than one base class. This feature is known as multiple inheritance. Several other languages permit a single base class and introduce a variety of mechanisms for pseudo-inheritance, such as Java interfaces and Ruby mix-ins and modules. Multiple inheritance in C++ is a superset of all these other behaviors.
Multiple Base Classes
Declare more than one base class by listing all the base classes in a comma-separated list. Each base class gets its own access specifier, as demonstrated in the following:
class derived : public base1, private base2, ...