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Whenever
we have virtual functions, we should always
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declare
the destructor to be virtual.
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Making
the destructor virtual will ensure that the correct
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destructor
will be called for an object when pointers to
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direct
or indirect base classes are used.
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If
the destructor is not declared to be virtual, then the
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destructor
is statically bound based on the type of pointer
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or
reference and the destructor for the actual object
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pointed
to will not be called when the object is
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deallocated.
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In
the account class’ public section add:
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virtual ~account();
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