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There are two features that add flexibility to delegates: covariance and contravariance Normally, the method that you pass to a delegate must have the same return type and signature as the delegate However, covariance and contravariance relax this rule slightly, as it pertains to derived types Covariance enables a method to be assigned to a delegate when the method s return type is a class derived from the class specified by the return type of the delegate Contravariance enables a method to be assigned to a delegate when a method s parameter type is a base class of the class specified by the delegate s declaration Here is an example that illustrates both covariance and contravariance:

class Test<T> where T : class {

// Demonstrate covariance and contravariance using System; class X { public int Val; } // Y is derived from X class Y : X { } // This delegate returns X and takes a Y argument delegate X ChangeIt(Y obj); class CoContraVariance { // This method returns X and has an X parameter

15:

The class constraint requires that any type argument for T be a reference type In this program, this is necessary because of what occurs inside the Test constructor:

Diversi cation allows us to reduce our vulnerability to the potential of weather, labor unrest, zoning, or taxation issues occurring in Florida 7 If these events occur in Florida, and we have more than one factory there, it is easy to no doubt see the problem Both factories are effected, not just one factory

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static X IncrA(X obj) { X temp = new X(); tempVal = objVal + 1; return temp; } // This method returns Y and has a Y parameter static Y IncrB(Y obj) { Y temp = new Y(); tempVal = objVal + 1; return temp; } static void Main() { Y Yob = new Y(); // In this case, the parameter to IncrA // is X and the parameter to ChangeIt is Y // Because of contravariance, the following // line is OK ChangeIt change = IncrA; X Xob = change(Yob); ConsoleWriteLine("Xob: " + XobVal); // In the next case, the return type of // IncrB is Y and the return type of // ChangeIt is X Because of covariance, // the following line is OK change = IncrB; Yob = (Y) change(Yob); ConsoleWriteLine("Yob: " + YobVal); } }

public Test() { // The following statement is legal only // because T is guaranteed to be a reference // type, which can be assigned the value null obj = null; }

The output from the program is shown here:

Xob: 1 Yob: 1

Here, obj (which is of type T) is assigned the value null This assignment is valid only for reference types As a general rule, you cannot assign null to a value type (The exception to this rule is the nullable type, which is a special structure type that encapsulates a value type and allows the value null See 14 for details) Therefore, without the constraint, the assignment would not have been valid and the compile would have failed This is one case in which the difference between value types and reference types might be important to a generic routine The value type constraint is the complement of the reference type constraint It simply ensures that any type argument is a value type, including a struct or an enum (In this context, a nullable type is not considered a value type) Here is an example:

In the program, notice that class Y is derived from class X Next, notice that the delegate ChangeIt( ) is declared like this:

delegate X ChangeIt(Y obj);

// Demonstrate a value type constraint using System; struct MyStruct { // } class MyClass { // } class Test<T> where T : struct { T obj; public Test(T x) { obj = x; } // } class ValueConstraintDemo { static void Main() { // Both of these declarations are legal Test<MyStruct> x = new Test<MyStruct>(new MyStruct()); Test<int> y = new Test<int>(10); // But, the following declaration is illegal! Test<MyClass> z = new Test<MyClass>(new MyClass()); } }

ChangeIt( ) returns X and has a Y parameter Next, notice that the methods IncrA( ) and IncrB( ) are declared as shown here:

static X IncrA(X obj) static Y IncrB(Y obj)

In this program, Test is declared as shown here:

Part I:

There s a split in nitive here, a wrong word, and the sentence construction is awkward I rewrote the sentence

class Test<T> where T : struct {

The IncrA( ) method has an X parameter and returns X The IncrB( ) method has a Y parameter and returns Y Given covariance and contravariance, either of these methods can be passed to ChangeIt, as the program illustrates Therefore, this line

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