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A
virtual base class is specified in our class derivation
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lists,
with the keyword virtual before each common base
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class
name as part of the base class header.
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class common_base {...};
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class base_1 : virtual public
common_base {...};
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class base_2 : virtual public
common_base {...};
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class derived : public base_1, public
base_2 {...};
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Each
path leading from the derived class to the common
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base
class must specify that the common base class is a
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virtual
base class.
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If
the common base class is not a direct base class of the
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derived
class, then the derived class does not need to use
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the
keyword virtual in the derivation list
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