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// Demonstrate generic interface contravariance using System; // This generic interface supports contravariance public interface IMyContraVarGenIF<in T> { void Show(T obj); } // Implement the IMyContraVarGenIF interface class MyClass<T> : IMyContraVarGenIF<T> { public void Show(T x) { ConsoleWriteLine(x); } } // Create a simple class hierarchy class Alpha { public override string ToString() { return "This is an Alpha object"; } // } class Beta : Alpha { public override string ToString() { return "This is a Beta object"; } // } class VarianceDemo { static void Main() { // Create an IMyContraVarGenIF<Alpha> reference to a // MyClass<Alpha> object // This is legal with or without contravariance IMyContraVarGenIF<Alpha> AlphaRef = new MyClass<Alpha>(); // Create an IMyContraVarGenIF<beta> reference to a // MyClass<Beta> object // This is legal with or without contravariance IMyContraVarGenIF<Beta> BetaRef = new MyClass<Beta>(); // Create an IMyContraVarGenIF<beta> reference to // a MyClass<Alpha> object // *** This is legal because of contravariance *** IMyContraVarGenIF<Beta> BetaRef2 = new MyClass<Alpha>(); // This call is legal with or without contravariance BetaRefShow(new Beta()); // Assign AlphaRef to BetaRef // *** This is legal because of contravariance *** BetaRef = AlphaRef;

18:

Hi Jim: Thank you for including me on yesterday s conference call After the call, it s clear that you and I need to come up with a system that ensures I m kept up-to-date on ABC business we need to coordinate more effectively How do you think you d like to handle this Would you keep me up-todate at every step along the way Let s meet tomorrow to discuss a plan of action Best, Paula

The real numbers are the set of all decimals, both terminating and nonterminating This set is rather sophisticated, and bears a little discussion A decimal number of the form

BetaRefShow(new Beta()); } }

The output is shown here:

A contravariant interface can be extended The process is similar to that described for extending a covariant interface To access the contravariant nature of the extended interface, the extending interface must specify in for the type parameter that corresponds to the contravarient type parameter in the base interface For example,

x = 316792

public interface IMyContraVarGenIF2<in T> : IMyContraVarGenIF<T> { // }

Notice that in is not required (nor would it be legal) to be specified in the base interface clause Furthermore, it is not required that IMyContraVarGenIF2 be contravariant In other words, it is not required that IMyContraVarGenIF2 modify T with in Of course, any benefits that could result from the contravariant IMyContraVarGen interface would be lost relative to the IMyContraVarGenIF2 interface Contravariance works only with reference types, and a contravariant type parameter can be applied only to method arguments Thus, in cannot be applied to a type parameter that is used for a return type

As explained in 15, non-generic delegates already support covariance and contravariance as they relate to method return types and parameter types Beginning with C# 40, these features are expanded for generic delegates to include type parameter covariance and contravariance These features work in a fashion similar to that just described for interfaces Here is an example of a contravariant delegate:

// Declare a generic delegate that is contravariant on T delegate bool SomeOp<in T>(T obj);

is actually a rational number, for it represents x = 316792 = A decimal number of the form m = 427519191919 , with a group of digits that repeats itself interminably, is also a rational number To see this, notice that 100 m = 427519191919 and therefore we may subtract: 100m = 427519191919 m= Subtracting, we see that 99m = 423244 or m= 423244 99000 4275191919 316792 100000

This delegate can be assigned a method whose parameter is T or a class from which T is derived Here is an example of a covariant delegate:

Note that adding references to Jim forced Paula to write less emotionally always a good idea in business With the new focus on Jim and his needs, the Empathy Index became positive (Note that the references to Jim [ them ] are in boldface and the references to Paula [ us ] are underlined The word we isn t counted because it refers to both Jim and Paula Likewise, the word Let s [ie, Let us ] isn t counted for the same reason) Them Us Empathy Index 6 (5) 1

// Declare a generic delegate that is covariant on T delegate T AnotherOp<out T, V>(V obj);