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// } // Demonstrate interface constraints class UseInterfaceConstraint { static void Main() { // The following code is OK because Friend // implements IPhoneNumber PhoneList<Friend> plist = new PhoneList<Friend>(); plistAdd(new Friend("Tom", "555-1234", true)); plistAdd(new Friend("Gary", "555-6756", true)); plistAdd(new Friend("Matt", "555-9254", false)); try { // Find the number of a friend given a name Friend frnd = plistFindByName("Gary"); ConsoleWrite(frndName + ": " + frndNumber); if(frndIsWorkNumber) ConsoleWriteLine(" (work)"); else ConsoleWriteLine(); } catch(NotFoundException) { ConsoleWriteLine("Not Found"); } ConsoleWriteLine(); // The following code is also OK because Supplier // implements IPhoneNumber PhoneList<Supplier> plist2 = new PhoneList<Supplier>(); plist2Add(new Supplier("Global Hardware", "555-8834")); plist2Add(new Supplier("Computer Warehouse", "555-9256")); plist2Add(new Supplier("NetworkCity", "555-2564")); try { // Find the name of a supplier given a number Supplier sp = plist2FindByNumber("555-2564"); ConsoleWriteLine(spName + ": " + spNumber); } catch(NotFoundException) { ConsoleWriteLine("Not Found"); } // The following declaration is invalid because EmailFriend // does NOT implement IPhoneNumber PhoneList<EmailFriend> plist3 = new PhoneList<EmailFriend>(); // Error! } }

// //

x 4

Part I:

In this version of the program, the interface constraint specified by PhoneList requires that a type argument implement the IPhoneList interface Because both Friend and Supplier implement IPhoneList, they are valid types to be bound to T However, EmailFriend does not implement IPhoneList and cannot be bound to T To prove this, remove the comment symbols from the last two lines in Main( ) As you will see, the program will not compile

The new( ) constructor constraint enables you to instantiate an object of a generic type Normally, you cannot create an instance of a generic type parameter However, the new( ) constraint changes this because it requires that a type argument supply a public parameterless constructor This can be the default constructor provided automatically when no explicit constructor is declared or a parameterless constructor explicitly defined by you With the new( ) constraint in place, you can invoke the parameterless constructor to create an object Here is a simple example that illustrates the use of new( ):

2 Determine whether the given function f is continuous at the given point c Give careful justifications for your answers x 2 c = 2 (a) f (x) = x+2 (b) f (x) = x 3 x+3 c=1 c=0 c=0

// Demonstrate a new() constructor constraint using System; class MyClass { public MyClass() { // } // } class Test<T> where T : new() { T obj; public Test() { // This works because of the new() constraint obj = new T(); // create a T object } // } class ConsConstraintDemo { static void Main() { Test<MyClass> x = new Test<MyClass>(); } }

First, notice the declaration of the Test class, shown here:

class Test<T> where T : new() {

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(c) f (x) = x cos(1/x) (d) f (x) = x 2 ln x (e) f (x) =

18:

Because of the new( ) constraint, any type argument must supply a parameterless constructor Next, examine the Test constructor, shown here:

public Test() { // This works because of the new() constraint obj = new T(); // create a T object }

A new object of type T is created and a reference to it is assigned to obj This statement is valid only because the new( ) constraint ensures that a constructor will be available To prove this, try removing the new( ) constraint and then attempt to recompile the program As you will see, an error will be reported In Main( ), an object of type Test is instantiated, as shown here:

(f) f (x) =

Test<MyClass> x = new Test<MyClass>();

Notice that the type argument is MyClass, and that MyClass defines a parameterless constructor Thus, it is valid for use as a type argument for Test It must be emphasized that it was not necessary for MyClass to explicitly declare a parameterless constructor Its default constructor would also satisfy the constraint However, if a class needs other constructors in addition to a parameterless one, then it would be necessary to also explicitly declare a parameterless version, too There are three important points about using new( ) First, it can be used with other constraints, but it must be the last constraint in the list Second, new( ) allows you to construct an object using only the parameterless constructor, even when other constructors are available In other words, it is not permissible to pass arguments to the constructor of a type parameter Third, you cannot use new( ) in conjunction with a value type constraint, described next