1. From an implementation point of view, multiple inheritance introduces two issues: • If an operation is defined in more than one of the base classes, which one is inherited by the derived class? • What does an object of a derived class look to an operation of the base class. For example, a _rectangle passed to a polygon operation should appear as a polygon object and passed to an operation of displayable should look like a displayable object. Find out and explain how C++ and Eiffel handle the first issue. Devise an implementation to solve the second issue. 2. Section 18.104.22.168 introduced the class-wide types of Ada 95. Consider the following code: Poly: Object ’Class; Mono: Circle; … Which of the two assignment statements are statically type-safe? Which one may raise a runtime exception? Based on what you know from this chapter, is Ada able to detect such an exception? Assume the classes point and color Point of Section 22.214.171.124. Given the procedure below: can we call the procedure with a color Point parameter? with a point parameter? Will the class definitions pass type checking in Eiffel? Will they pass type checking in C++? Will a call to procedure problem cause a runtime error in C++? Will in cause a runtime error in Eiffel? Can we modify the class definitions to avoid a runtime error?
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