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As you can see, the big difference with this code is that the methods that have out or ref reference type parameters are constructing an object, and the pointer to the new object is returned to the caller . You ll also notice that the ContinueProcessingFiles method can manipulate the object being passed into it before returning a new object . This is possible because the parameter is marked with the ref keyword . You can simplify the preceding code a bit, as shown here:

CHARACTERS: THRASYMACHUS A green, theoretical purist who believes everything he reads CALLICLES A battle-hardened veteran from the old school a real programmer GLAUCON A young, confident, hot-shot computer jock

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You now have the directory structure shown in figure 2.24. The directory structure has changed, whereas the repository layout remains the same. Now you can reference Framework from a subdirectory pulled by SVN within your Windows and web clients. Go back to Visual Studio. In the Solution Explorer, rightclick the Windows Calculator solution, and choose Add > Existing Project. Choose the CalcCore project from the subdirectory within the project folder. Your solution should look like figure 2.25. The library project is shared (including the source) among the client projects. Doing it this way requires more work than creating a solid project structure up front and checking it in. But this way, you have every project in its own repository, and you can reference them as you like. This approach can be handy in some scenarios such as simultaneous development of two projects that are destined to live separately in the future and are placed in separate repositories. In some scenarios (such

using System; using System.IO; public sealed class Program { public static void Main() { FileStream fs = null; // Initialized to null (required) // Open the first file to be processed. ProcessFiles(ref fs); // Continue while there are more files to process. for (; fs != null; ProcessFiles(ref fs)) { // Process a file. fs.Read(...); } } private static void ProcessFiles(ref FileStream fs) { // Close the previous file if one was open. if (fs != null) fs.Close(); // Close the last file worked on. // Open the next file, or if no more files, "return" null. if (noMoreFilesToProcess) fs = null; else fs = new FileStream (...); } }

ISMENE A senior programmer tired of big promises, just looking for a few practices that work SOCRATES The wise old programmer

Here s another example that demonstrates how to use the ref keyword to implement a method that swaps two reference types:

I want to suggest a commenting standard for our projects, Thrasymachus said Some of our programmers barely comment their code, and everyone knows that code without comments is unreadable You must be fresher out of college than I thought, Callicles responded Comments are an academic panacea, but everyone who s done any real programming knows that comments make the code harder to read, not easier English is less precise than Java or Visual Basic and makes for a lot of excess verbiage Programming-language statements are short and to the point If you can t make the code clear, how can you make the comments clear Plus, comments get out of date as the code changes If you believe an out-of-date comment, you re sunk I agree with that, Glaucon joined in Heavily commented code is harder to read because it means more to read.

// // // // // // The object is being disposed/closed or finalized, do the following: If resource was already released, just return If ownsHandle is false, return Set flag indicating that this resource has been released Call the virtual ReleaseHandle method Call GC.SuppressFinalize(this) to prevent Finalize from being called

Implementing the dispose pattern is hardly trivial . Now let me explain what all this code does . First, the SafeHandle class implements the System.IDisposable interface . This interface is defined in the FCL as follows:

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