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Using this variety of reader references adds liveliness and reader interest to the memo Mary Jo signaled a strong connection with her volunteers by referring to them in so many different ways Mary Jo said, I was very conscious of the Empathy Index as I created the rst draft Being aware of it saved me a lot of time I found that I d pause between sentences and consider how I could integrate one or more of the four options for referring to my readers At the time, I thought these pauses would add up to extra time in writing But no it actually saved me time When I write, typically I know what I want to say What was new to me in the writing process was to pause and think for a moment about how I wanted to say it The idea of adding a reference to my readers in every sentence, if I could, was new to me Soon it became second nature, and I discovered that my first drafts were so much better than they used to be that it took me less time to revise them which means the memo writing process became quicker once I got used to the system By writing better, more focused rst drafts, I ve reduced the time it takes me to write a decent communication by about a third EXERCISE 8: Rewrite to Improve the Empathy Index In the E-mail below from Paula, a manager, to Jim, an engineer, calculate the Empathy Index Then, using the techniques discussed above, rewrite it to increase the Empathy Index

Gen<int, int> notOK = new Gen<int, int>();

A sponge is in the shape of a right circular cone (Figure 316) As it soaks up water, it grows in size At a certain moment, the height equals 6 inches, and is increasing at the rate of 03 inches per second At that same moment, the radius is 4 inches, and is increasing at the rate of 02 inches per second How is the volume changing at that time

In this case, both T and V will be replaced by int This makes both versions of Set( ) identical, which is, of course, an error Thus, when the attempt to call Set( ) on notOK occurs later in Main( ), a compile-time ambiguity error is reported In general, you can overload methods that use type parameters as long as there is no constructed type that results in a conflict Like methods, constructors, operators, and indexers that use type parameters can also be overloaded, and the same rules apply

18:

In 15, covariance and contravariance were described as they relate to non-generic delegates That form of contravariance and covariance is still fully supported by C# 40 and is quite useful However, C# 40 expands the covariance and contravariance features to include generic type parameters that are used by generic interfaces and generic delegates One of their principal uses is to streamline certain types of situations encountered when using generic interfaces and delegates defined by the NET Framework, and some interfaces and delegates defined by the library have been upgraded to use type parameter covariance and contravariance Of course, they can also be beneficial in interfaces and delegates that you create This section explains the generic type parameter covariance and contravariance mechanisms and shows examples of both

As it applies to a generic interface, covariance is the feature that enables a method to return a type that is derived from the class specified by a type parameter In the past, because of the strict type-checking applied to generics, the return type had to match the type parameter precisely Covariance relaxes this rule in a type-safe way A covariant type parameter is declared by preceding its name with the keyword out To understand the implications of covariance, it is helpful to work through an example First, here is a very simple interface called IMyCoVarGenIF that uses covariance:

We know that the volume V of a right circular cone is related to the height h and the radius r by the formula 1 2 r h 3

// This generic interface supports covariance public interface IMyCoVarGenIF<out T> { T GetObject(); }

Pay special attention to the way that the type parameter T is declared It is preceded by the keyword out When used in this context, out specifies that T is covariant Because T is covariant, GetObject( ) can return a reference of type T or a reference of any class derived from T Although covariant on T, IMyCoVarGenIF is implemented just like any other generic interface For example, here it is implemented by MyClass:

// Implement the IMyCoVarGenIF interface class MyClass<T> : IMyCoVarGenIF<T> { T obj; public MyClass(T v) { obj = v; } public T GetObject() { return obj; } }