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Whenever
there is dynamic memory allocated on an
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object-by-object
basis in a class, we should overload the
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assignment
operator for the same reasons that require the
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copy
constructor
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The
assignment operator must be overloaded as a member,
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and
it doesn’t modify the second operand (so if it is an
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object
of a class -- it should be a const ref.)
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The
assignment operator can be chained, so it should
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return
an lvalued object, by reference
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It
modifies the current object, so it cannot be a const
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member
function
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