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The optical wireless mesh network brings together two technologies: optical and mesh networking Optical wireless technology uses a wireless infrared optical signal to transport high bandwidth data over distances in the range of tens of meters to hundreds of meters It has the benefit of being able to deliver data rates comparable to that of fiber-optic cables with the added flexibility of wireless communication Mesh networking technology, on the other hand, offers the benefit of high reliability and high capacity networking It can also deliver the high-grade network services demanded by Carrier Ethernet services Optical wireless mesh networks therefore bring together the benefits of three diverse technologies, optical, wireless and mesh, as illustrated in Figure 91, Because of these benefits, an optical wireless mesh network can provide an ideal platform for delivering carrier-class Ethernet services and other kinds of network services in a large number of applications In this chapter, we discuss the benefits and shortcomings of both these technologies and how they fit together as an emerging technology to deliver Carrier Ethernet services We also discuss typical applications and deployment scenarios and end the chapter with a brief review of products available today from various vendors

As you can see, printf( ) inside serror( ) is called with a character pointer that points to one of the various error messages indexed by the error number passed to the function For example, if num is passed a 2, the message Write Error is displayed As a point of interest, note that the command line argument argv is an array of character pointers

Animating a color The buttons are reacting nicely now, but we also allow users to enter values via the keyboard. When the value changes in the text box at the top of the calculator, you can tell because, well, the value has changed. But we can add some emphasis by having the text in the text box change color whenever its value changes. Instead of creating a style, we re going to define this behavior directly on the TextBox element. Generally, you d define something like this in a style, but you should be aware that you can do all these things directly and there are situations where that makes sense for instance, if the behavior is something that needs to happen even if styles are changed. Listing 8.5 shows the XAML for the TextBox with all the handling for the event and the animation.

The concept of arrays of pointers is straightforward because the indexes keep the meaning clear However, cases in which one pointer points to another can be very confusing A pointer to a pointer is a form of multiple indirection, or a chain of pointers Consider Figure 6-3 In the case of a normal pointer, the value of the pointer is the address of the location that contains the value desired In the case of a pointer to a pointer, the first pointer contains the address of the second pointer, which contains the address of the location that contains the value desired

The term optical wireless captures two essential elements of the technology that makes it very appealing for networking applications It is a technology that offers ultra-high bandwidth of optical communication along with the convenience of wireless communication The technology uses optical signals to communicate wirelessly over a range of distances The first recorded use of an optical signal as a mean of communication goes as far back as the times of the Ancient Greeks when signals were transmitted over long distances by using shiny objects to reflect sunlight Its first modern use, in the form of a device called a heliograph, was in 1935 when the US and British armies sent Morse code over distances of tens of miles by using mirrors to create flashes of reflected sunlight

6:

Figure 6-3

<TextBox FontSize="18" Name="textBoxDisplay" Grid.Column="0" Grid.ColumnSpan="4" Grid.Row="1" VerticalContentAlignment="Center" HorizontalContentAlignment="Right">0 <TextBox.Triggers> <EventTrigger RoutedEvent="TextBox.TextChanged"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="textBoxDisplay" Storyboard.TargetProperty="Foreground.Color" To="Gold" Duration="0:0:0.2" AutoReverse="True"/> </Storyboard> </BeginStoryboard>

Multiple indirection can be carried on to whatever extent desired, but there are few cases where using more than a pointer to a pointer is necessary, or even wise Excessive indirection is difficult to follow and prone to conceptual errors (Do not confuse multiple indirection with linked lists, which are used in databases) A variable that is a pointer to a pointer must be declared as such This is done by placing an additional asterisk in front of its name For example, this declaration tells the compiler that newbalance is a pointer to a pointer of type float

9

float **newbalance;