define a relation s t2 indicating a function that takes an argument of type t1 and produces a result of type t2.
1. Let us define a relation s t2 indicating a function that takes an argument of type t1 and produces a result of type t2. How would you state the covariance and requirements using the subtype relation. That is, complete the equivalence relation below: ????1 −> ????2 ????2 ???????????? ????1 ? ????1 && ????2 ? ????2. How would you describe the Eiffel rule? 2. In C++, it is possible for a derived class to hide the public members of its base class from its clients. Give an argument to show that this is not a good design practice.
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