h15: Container Classes Review

Reading: Container Classes Review, DS Chapter 3, and the assert() function on p. 793

1. (10 pts) Fill in the information in the header. The following are required to get the 10 "participation" points.
   • Filling in your name and umail address.
     

   Also: For paper submission PLEASE submit on ONE SHEET OF PAPER, double-sided if at all possible. If you must submit on two printed sheets write name on BOTH sheets and no staples, paperclips, or folded corners.
   

2. Chapter 3 is a chapter you likely already read during CMPSC 24, but we want to review the material now. You will likely have a deeper appreciation and understanding of the material now, from the perspective of greater familiarity with C++ classes, objects, algorithm analysis, and data structures. The questions below emphasize a few important points we are building on and reinforcing in CMPSC 32.
   In particular, I want to make sure you can demonstrate that you understand:
   • the concept of a typedef, and the way it lays the foundation here for template classes.
   • the std::size_t data type and why it is used.
   • the idea of value semantics as used by the authors of DS (which is important to understanding copy constructor and overloaded = operator as discussed in DS).
   • how operator overloading works (the example of the operator + used in this chapter.
   • the way the static member constant is used to define a capacity.
   • the notion of a "partially filled array", i.e. occupancy vs. capacity
   • the circumstances in which a value type must have a default constructor (p. 110).
   • the way the assert macro is used in this code example.
   • short circuit evaluation as a guard against invalid operations (pp. 114-115).
   • the use of the STL multiset template class

   There are MANY more things in this chapter that are also important. Space and time prohibit me from asking a specific homework questions about each of them. I encourage to read the WHOLE chapter carefully rather than just skimming for the answers to the questions on the back, and be sure you understand at least all of the items listed above. I may ask you about anything in this chapter on the midterm exam (well, this should all be review by now), even if is not specifically covered on this homework assignment, but especially the items in the list above.

   After reviewing the chapter, answer these questions:
3. (6 pts) In the example Bag class in this chapter, the authors use the statement:

      typedef int value_type;
   

   What do the authors cite as the advantages of doing this typedef over just using int throughout the definition of the Bag class?

    
4. (6 pts) The size_t type is frequently defined in C/C++ software. What advantage does it have over just using int? (Note: the textbook offers an explanation, and we'll accept the textbook's explanation as a sufficient answer, but if you want to really understand, you may need to do some research online on your own.)
    
5. (6 pts) Another potential use of a typedef is to shorten a type. For example, we can have a function with this prototype that uses std::pair<double,double> to represent an (x,y) point in the cartesian plane:

   double distanceBetween(pair<double,double> p1, pair <double,double> p2);
   

   Write a typedef statement that would allow us to write this as:

      double distanceBetween(Point p1, Point p2);
   

    
6. The authors of DS frequently talk about the value semantics of a data type. At the top of figure 3.1, they indicate that the typedef for value_type may be any of the C++ built-in types (int, char, etc.) OR any type that meets four criteria. What are the four criteria that indicate what the type must meet? List them below.
   • (3 pt)
      
   • (3 pt)
      
   • (3 pt)
      
   • (3 pt)
      
   • (5 pts) The textbook discussion goes on to explain that the assignment operator is NOT defined for every data type, and they cite an example. What example do they cite?
      
7. (5 pts) What is the purpose of the assert() macro?