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Returns the object at the front of the invoking queue The object is removed in the process Adds v to the end of the queue Returns the object at the front of the invoking queue, but does not remove it Returns an array that contains copies of the elements of the invoking queue Removes the excess capacity of the invoking queue if its size is less than 90 percent of its capacity
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This example uses a queue to simulate scheduling access to a network by a collection of users It doesn t actually do any real scheduling Instead, it simply fills a queue with the names of the users and then grants the users access based on the order in which they are entered into the queue Of course, since this is a simulation, the program simply displays the user s name when a user is granted access
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1 Begin creating the simulation as shown here:
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// Use the Queue<T> class to simulate scheduling user access to a network using System; using SystemCollectionsGeneric; class QueueDemo { static void Main() { Queue<string> userQ = new Queue<string>();
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Notice that a Queue called userQ is created that can hold references to objects of type string
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2 Add the following code that puts user names into the queue: ConsoleWriteLine("Adding users to the network user queue\n"); userQEnqueue("Eric"); userQEnqueue("Tom"); userQEnqueue("Ralph"); userQEnqueue("Ken"); 3 Add the code that removes one name at a time, which simulates granting access to the network
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ConsoleWriteLine("Granting network access in queue order\n"); while(userQCount > 0) { ConsoleWriteLine("Granting network access to: " + userQDequeue()); }
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The Preprocessor, RTTI, Nullable Types, and Other Advanced Topics
4 Finish the program ConsoleWriteLine("\nUser queue is exhausted"); } } 5 Here is the complete program that uses Queue<T> to simulate scheduling users access to
a network:
// Use the Queue<T> class to simulate scheduling access to a network using System; using SystemCollectionsGeneric; class QueueDemo { static void Main() { Queue<string> userQ = new Queue<string>(); ConsoleWriteLine("Adding users to the network user queue\n"); userQEnqueue("Eric"); userQEnqueue("Tom"); userQEnqueue("Ralph"); userQEnqueue("Ken"); ConsoleWriteLine("Granting network access in queue order\n"); while(userQCount > 0) { ConsoleWriteLine("Granting network access to: " + userQDequeue()); } ConsoleWriteLine("\nUser queue is exhausted"); } }
The output is shown here:
Adding users to the network user queue Granting network access in queue order Granting Granting Granting Granting network network network network access access access access to: to: to: to: Eric Tom Ralph Ken
User queue is exhausted
(continued)
C# 30: A Beginner s Guide
A key point about this example is how little code is needed to implement the simulation If you had to actually develop the queue yourself (as previous Try This examples did), the code would be much larger Furthermore, the standard Queue<T> class offers a solution that all C# programmers will instantly recognize, thus making your programs easier to maintain
Other Keywords
To conclude this book, the few remaining keywords defined by C# that have not been described elsewhere are briefly discussed
The internal Access Modifier
In addition to the access modifiers public, private, and protected, which we have been using throughout this book, C# also defines internal Mentioned briefly in 6, internal declares that a member is known throughout all files in an assembly, but unknown outside that assembly An assembly is a file (or files) that contains all deployment and version information for a program Thus, in simplified terms, a member marked as internal is known throughout a program, but not elsewhere
sizeof
Occasionally, you might find it useful to know the size, in bytes, of one of C# s value types To obtain this information, use the sizeof operator It has this general form: sizeof(type) Here, type is the type whose size is being obtained Thus, it is intended primarily for special-case situations, especially when working with a blend of managed and unmanaged code
lock
The lock keyword is used when working with multiple threads In C#, a program can contain two or more threads of execution When this is the case, pieces of the program are multitasked Thus, pieces of the program execute independently and simultaneously This raises the prospect of a special type of problem: What if two threads try to use a resource that can be used by only one thread at a time To solve this problem, you can create a critical code section that will be executed by one and only one thread at a time This is accomplished by lock Its general form is shown here: lock(obj) { // critical section } Here, obj is the object on which the lock is synchronized If one thread has already entered the critical section, then a second thread will wait until the first thread exits the critical section
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