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Notice that Friend adds a property called IsWorkNumber, which returns true if the telephone number is a work number To manage telephone lists, you create a class called PhoneList Because you want this class to manage any type of phone list, you make it generic Furthermore, because part of the list management is looking up numbers given names, and vice versa, you add the constraint that requires that the type of objects stored in the list must be instances of a class derived from PhoneNumber

) Then f ( s) = 3s 2 and f 1 ( t) =

// PhoneList can manage any type of phone list // as long as it is derived from PhoneNumber class PhoneList<T> where T : PhoneNumber { T[] phList; int end; public PhoneList() { phList = new T[10];

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Part I:

end = 0; } // Add an entry to the list public bool Add(T newEntry) { if(end == 10) return false; phList[end] = newEntry; end++; return true; } // Given a name, find and return the phone info public T FindByName(string name) { for(int i=0; i<end; i++) { // Name can be used because it is a member of // PhoneNumber, which is the base class constraint if(phList[i]Name == name) return phList[i]; } // Name not in list throw new NotFoundException(); } // Given a number, find and return the phone info public T FindByNumber(string number) { for(int i=0; i<end; i++) { // Number can be used because it is also a member of // PhoneNumber, which is the base class constraint if(phList[i]Number == number) return phList[i]; } // Number not in list throw new NotFoundException(); } // }

1 1 1 1 = 2 = = t 2/3 3 f ( f 1 ( t) ) 3s 3 [t1/3 ]2

The base class constraint enables code inside PhoneList to access the properties Name and Number for any type of telephone list It also guarantees that only valid types are used to construct a PhoneList object Notice that PhoneList throws a NotFoundException if a name or number is not found This is a custom exception that is declared as shown here:

class NotFoundException : Exception { /* Implement all of the Exception constructors Notice that the constructors simply execute the base class constructor Because NotFoundException adds nothing to Exception, there is no need for any further actions */

18:

public NotFoundException() : base() { } public NotFoundException(string message) : base(message) { } public NotFoundException(string message, Exception innerException) : base(message, innerException) { } protected NotFoundException( SystemRuntimeSerializationSerializationInfo info, SystemRuntimeSerializationStreamingContext context) : base(info, context) { } }

Formula ( ) may be applied to obtain some interesting new derivatives to add to our library We record some of them here: I II d arcsin x = dx 1 1 x2

Although only the default constructor is used by this example, NotFoundException implements all of the constructors defined by Exception for the sake of illustration Notice that these constructors simply invoke the equivalent base class constructor defined by Exception Because NotFoundException adds nothing to Exception, there is no reason for any further action The following program puts together all the pieces and demonstrates PhoneList Notice that a class called EmailFriend is also created This class does not inherit PhoneNumber Thus, it cannot be used to create a PhoneList