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Generics are a welcome addition to the C# language. They provide two key features: compiletime type-safety and the elimination of boxing and unboxing operations for value types. Generics fall into the group of language elements that initially appear rather bland, utilitarian, and limited in scope, but they allow powerful code patterns and elegant designs that are difficult to achieve in their absence. The real design clue that indicates generics are required is loosely typed declarations. If parameters or return types are declared as object even though it feels like stronger typing would be better, it s generally a good time to introduce generics. Feeling a desire for stronger typing is often associated with the requirement to perform a significant number of casting operations. So, to make this advice a bit more concrete, if there s a couple of casts (or more) required to perform a particular logical operation, such as opening a database connection, it s a good indication you should use generics. As with any new language or developer tool feature, there can be a tendency to overuse the new toy to solve every coding problem. And as with all new toys, the greatest joy and satisfaction may come from using the toy in unanticipated and novel ways, but be wary of overuse that can come from the everything looks like a nail when my only tool is a hammer pattern of thought. A common question about generic constraints is, why are they so limited in what they support Although it s possible to provide a more extensive constraint syntax, it s not clear at this point where the ultimate sweet spot is for such support, so it was decided to step lightly in this version, with the possibility for more support in future versions of the language.

One of the projects I m working on is a bunch of scripts Sal Soghoian (AppleScript product manager) wrote for Showtime Networks. The scripts automate the creation of the Upcoming Shows menus for about ten of Showtime Networks affiliate stations. Sal initially created the scripts as a public relations campaign for Showtime, and it really worked well. It also worked well for me to inherit the project, since besides billing for the time, I got to learn a lot from Sal s AppleScript mastery. One of the neat features in these scripts was that, besides the localized error trapping that was implemented throughout the script, every script had one big try statement that covered it from head to toe. The purpose of this try block s on error handler wasn t to notify the user that something wrong went down AppleScript s built-in error dialog box would have done that. The purpose was to cause the script to display the error message in a nice dialog box instead of the typical error message AppleScript displays in case of unhandled errors, with the dreaded Edit button that, no matter what I tell them, users always seem to want to click. Figure 17-3 shows the AppleScript generic-style error message dialog box.

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You should use structs only for types that are really just pieces of data for types that could be used in a similar way to the built-in types. A type, for example, is like the built-in type decimal, which is implemented as a value type. Even if more complex types can be implemented as value types, they probably shouldn t be, since the value type semantics will probably not be expected by the user. The user will expect that a variable of the type could be null, which isn t possible with value types.

Audio playback can be easy or hard, depending on your needs. I found that I needed the hard way, but I figured it out, and I hope this helps you do the same. In many cases, it s possible to use one of the easier approaches, and in those cases there s not much reason to bother with the Core Audio approach I ve described. The streaming code will work just as well for locally stored files (via file:// URLs) as it does for remote files. But AVAudioPlayer is an excellent and simpler choice for playing audio files included in your application. If that s what you re doing, then there s no reason to complicate matters. The Core Audio approach is still best if you re playing music downloaded from the Internet whether it s a live broadcast or an audio file available at a web site. For the live broadcast it s the only option, and for the static file this approach makes it possible to begin playback without waiting while you download the entire file first. I also talked about the AVAudioSession class in light of the iPhone OS 3.0 release. Good luck with your audio projects. And don t be afraid of C!

Binary trees and recursion were made for each other. To search a tree recursively, the recursing function has to visit the current node, as well as call itself with each of its two child nodes. The child nodes will do the same thing with themselves and their child nodes. Each part of the recursion stops when a terminal node is encountered. Check out this piece of code:

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