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Compiler Error C2500

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'identifier1' : 'identifier2' is already a direct base class

A class or structure appears more than once in a list of base classes.

A direct base is one mentioned in the base list. An indirect base is a base class of one of the classes in the base list.

A class cannot be specified as a direct base class more than once. A class can be used as an indirect base class more than once.

The following sample generates C2500:

// C2500.cpp
// compile with: /c
class A {};
class B : public A, public A {};    // C2500

// OK
class C : public A {};
class D : public A {};
class E : public C, public D {};