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virtual destructors: If a pointer to the base class is used to delete an object that might actually be a derived-class object, then the base class needs a virtual destructor If the class has no other need for a destructor, then the virtual destructor still must be defined and should be empty:
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class base { public: virtual ~base(){ } };
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As with any other function, the virtual nature of the destructor is inherited by the derived classes, and there is no need to redefine the destructor in the derived classes Constructors and virtual functions: While an object is under construction, its type is the type of the class that is being constructed even if the object is part of a derived-class object Thus, calls to virtual functions from inside a constructor are statically bound to the version for the type being constructed Class friendship: A class can designate another as its friend; doing so grants friendship to all the member functions of the other class Friendship is neither inherited nor transitive; friends of friends and classes derived from friends have no special privileges Static members exist as members of the class, rather than as an instance in each object of the class Therefore, the this keyword is not available in a static member function Such functions may access only static data members There is a single instance of each static data member for the entire class, which must be initialized, usually in the source file that implements the class member functions Because the member is initialized outside the class definition, you must fully qualify the name when you initialize it:
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value-type class-name::static-member-name = value;
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says that the static member named static-member-name from the class class-name has type value-type and is given the initial value value
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Exercises
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13-0 Compile, execute, and test the programs in this chapter 13-1 Annotate the Core and Grad constructors to write the constructor's name and argument list when the constructor is executed For example, you should add a statement such as
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cerr << "Grad::Grad(istream&)" << endl;
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to the Grad constructor taking an istream& parameter Then write a small program that exercises each constructor Predict beforehand what the output will be Revise your program and predictions until your predictions match what is actually written 13-2 Given the Core and Grad classes defined in this chapter, indicate which function is called for each of these invocations:
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Core* p1 = new Core; Core* p2 = new Grad; Core s1; Grad s2; p1->grade(); p1->name();
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p2->grade(); p2->name(); s1grade(); s1name(); s2name(); s2grade();
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Check whether you are correct by adding output statements to the name and grade functions that indicate which function is being executed 13-3 The class that we built in 9 included a valid member that allowed users to check whether the object held values for a student record or not Add that functionality to the inheritance-based system of classes 13-4 Add to these classes a function that will map a numeric grade to a letter grade according to the grading policy outlined in 103/177 13-5 Write a predicate to check whether a particular student met all the relevant requirements That is, check whether a student did all the homework, and if a graduate student, whether the student wrote a thesis 13-6 Add a class to the system to represent students taking the course for pass/fail credit Assume that such students need not do the homework, but might do so If they do, the homework should participate in determining whether they passed or failed, according to the normal formula If they did no homework, then the grade is the average of their midterm and final grades A passing grade is 60 or higher 13-7 Add a class to the system to represent students auditing the course 13-8 Write a program to generate a grade report that can handle all four kinds of students 13-9 Describe what would happen if the assignment operator in 1342/247 failed to check for self-assignment
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