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Nesting
is quite different than declaring friends. Friends
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provide
special privileges to members; whereas, nesting
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restricts
the scope of a class' name and can reduce the
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global
namespace pollution.
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A
class' definition can be placed inside the public,
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protected,
or private sections of another class. The purpose
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of
this is to hide the nested class' name inside another
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class,
restricting access to that name.
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It
does not give either the outer class or the nested class
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any
special privileges to access protected or private
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members
of either class.
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A
nested class does not allow the outer class access to its
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hidden
members....the name of the nested class is hidden.
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