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| • |
The
simple syntactic change of adding the virtual
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keyword
to the declaration of statement has significantly
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changed
the output.
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| • |
In
this example, the member function statement is a
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virtual
function. It is defined in the base class and is
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overridden
in the derived classes.
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| • |
Notice
that the signature and return types are the same.
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Also
notice that the keyword virtual only occurs in the
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base
class' definition. It is this declaration that enables
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dynamic
binding.
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Finally,
notice that we call the member function
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statement
through a pointer or reference.
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