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You can derive a class from any number of base
classes. Deriving a class from more than one direct base
class is called multiple inheritance.
In the following example, classes A, B, and C are
direct base classes for the derived class X:
class A { /* ... */ };
class B { /* ... */ };
class C { /* ... */ };
class X : public A, private B,
public C { /* ... */ };
The following inheritance graph describes the
inheritance relationships of the above example. An arrow
points to the direct base class of the class at the tail of
the arrow:
The order of derivation is relevant only to determine the
order of default initialization by constructors and cleanup
by destructors.
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