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We
can force application programs to always use pointers
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to
base class objects instead of using pointers to derived
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class
objects or using objects directly by making the
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overridden
member functions protected or private in the
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derived
classes.
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This
is a way to force applications to adhere to the defined
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interface
provided by the base class and to help ensure that
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dynamic
binding will be used.
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It
causes compilation errors to result if the application
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attempts
to use static binding:
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student* ps = &smith;
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ps->statement(); //illegal access-protected member.
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smith.statement(); //illegal
access-protected member.
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