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Further, there can be multiple storage servers. That configuration can even be used for multiple legacy systems, effectively combined by the core tier. Even further, the design can be applied to distributed processing, as multiple core servers. So, a single tier can have many instances; this is commonly called n-tier, but it s still the 3-tier design, just with n nodes. The term enterprise software refers to an application for shared data, typically among employees of a company; this can actually be applied to any shared configuration, but the term was created for the 3-tier design on the client/server configuration, because of its complexity. Occurring at the same time as object orientation, and adding to its uses, all of these technologies are also becoming more organized and more extensive. The newer ones have increasing infrastructure, fairly standardized, built by relatively few organizations. While this significantly intensifies each learning curve, at the same time, it allows designers and programmers to have more and more examples of (usually) very solid software to study and, to varying degrees, pattern after, because the infrastructures are built by experts developers who are closest to the origin of the technologies or developers who have specific insights. So, this aspect is a compensation; it diminishes the learning curve.

As with other value type data, if you want to use a struct instance as a reference type object, you must make a boxed copy. Boxing and unboxing are covered in detail in 18.

Structs can be used as return values and parameters. Return value: When a struct is a return value, a copy is created and returned from the function member. Value parameter: When a struct is used as a value parameter, a copy of the actual parameter struct is created. The copy is used in the execution of the method. ref and out parameters: If you use a struct as a ref or out parameter, a reference to the struct is passed into the method so that the data members can be changed.

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Because some processes take longer than it takes to type successive keys, reliable keystroke processing also requires keystroke pooling. This is a level of indirection; the program monitors the pool. It checks the pool for characters. If any are there, it reads one and processes that, by evaluation and branching. Then it checks again; so, this processing is in a cycle. It is also an example of indirection between interaction and processing. (And it s what allows type-ahead entry.)

Allocating structs requires less overhead than creating instances of a class, so using structs instead of classes can sometimes improve performance but beware of the high cost of boxing and unboxing. Finally, some last things you should know about structs are the following: The predefined simple types (int, short, long, etc.), although considered primitives in .NET and C#, are all actually implemented under the covers in .NET as structs. You can declare partial structs in the same way as partial classes, as described in 6. Structs, like classes, can implement interfaces, which will be covered in 17.

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An enumeration, or enum, is a programmer-defined type, like a class or a struct. Like structs, enums are value types, and therefore store their data directly, rather than separately, with a reference and data. Enums have only one type of member: named constants with integral values. The following code shows an example of the declaration of a new enum type called TrafficLight, which contains three members. Notice that the list of member declarations is a comma-separated list; there are no semicolons in an enum declaration. Keyword Enum name enum TrafficLight { Green, Comma separated no semicolons Yellow, Comma separated no semicolons Red } Every enum type has an underlying integral type, which by default is int. Each enum member is assigned a constant value of the underlying type. The compiler assigns 0 to the first member, and assigns each subsequent member the value one more than the previous member. For example, in the TrafficLight type, the compiler assigns the int values 0, 1, and 2 to members Green, Yellow, and Red, respectively. In the output of the following code, you can see the underlying member values by casting them to type int. Their arrangement on the stack is illustrated in Figure 13-1. TrafficLight t1 = TrafficLight.Green; TrafficLight t2 = TrafficLight.Yellow; TrafficLight t3 = TrafficLight.Red; Console.WriteLine("{0},\t{1}", t1, (int) t1); Console.WriteLine("{0},\t{1}", t2, (int) t2); Console.WriteLine("{0},\t{1}\n", t3, (int) t3); Cast to int

This code produces the following output: Green, 0 Yellow, 1 Red, 2