[class.mi] (original) (raw)

[Note 6:

A class can have both virtual and non-virtual base classes of a given type.

class B { };class X : virtual public B { };class Y : virtual public B { };class Z : public B { };class AA : public X, public Y, public Z { };

For an object of class AA, all virtual occurrences of base class B in the class lattice of AA correspond to a single B subobject within the object of type AA, and every other occurrence of a (non-virtual) base class B in the class lattice of AA corresponds one-to-one with a distinctB subobject within the object of type AA.

Given the class AA defined above, class AA has two subobjects of class B: Z's B and the virtual B shared by X and Y, as shown in Figure 6.