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We
will talk about this again once we discuss operator
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overloading.
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But,
for those of you already familiar with operator
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overloading,
keep in mind you need to careful within a
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hierarchy.
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For
the assignment operator, this is not as simple. We must
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invoke
the base class' assignment operator from within the
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body
of our derived class' assignment op.
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To
do so requires that we cast the current object (accessible
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by
*this) into a base class object as follows:
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student &student::operator=(const student &s) {
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static_cast<checking
&>(*this) = s;
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