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Previously,
we recommended that data members be
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specified
in the private section.
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By
following this guideline when designing hierarchies,
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all
derived classes would explicitly need to use the base
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class'
public member functions to access inherited data.
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This
isn't practical when building classes that are intended
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to
work in harmony with one another. And, it reduces our
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ability
to extend the functionality of a given class in the
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future.
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By
declaring members as protected, derived classes have
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access
to base class members while restricting access by
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client
applications.
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