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12.1.3 Converter parameters Our NumberToFormattedTextValueConverter takes a number and gives us back a string in IEC format. But, some people might not like that format, and might want to use something more traditional. We could accommodate that wish by writing multiple converters (NumberToIecValueConverter, NumberToSiValueConverter, and so on), but it would be nice if we could use the same converter and pass a parameter for the format to use. In fact, we can do just that one of the values passed to the Convert method of IValueConverter is called parameter. We can modify our Convert method to look at that value and use it (listing 12.3).

9:

#if MAX>99 printf("Compiled for array greater than 99\n"); #else printf("Compiled for small array\n"); #endif return 0; }

Based on the preceding points, it should be clear how using FSO technology helps wireless mesh networks overcome some of their limitations, making FSO ideally suited for wireless mesh networks This complement does not flow in only one direction, however Mesh networks also enable FSO to overcome some of its key limitations

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { Int64 size = System.Convert.ToInt64(value); string units = (parameter != null) parameter.ToString() : "IEC"; switch (units) IEC { version case "IEC": size = size / 1024; if (size < 1024) return size.ToString() + " KiB"; else return (size / 1024).ToString() + " MiB"; case "BINARYSI": Binary SI size = size / 1024; version if (size < 1024) return size.ToString() + " KB"; else return (size / 1024).ToString() + " MB"; case "SI": size = size / 1000;

In this case, MAX is defined to be less than 99, so the #if portion of the code is not compiled Instead, the #else alternative is compiled and the message Compiled for small array is displayed Notice that the #else is used to mark both the end of the #if block and the beginning of the #else block This is necessary because there can be only one #endif associated with any #if The #elif directive means else if and establishes an if-else-if chain for multiple compilation options The #elif is followed by a constant expression If the expression is true, that block of code is compiled and no other #elif expressions are tested Otherwise, the next block in the series is checked The general form of the #elif is #if expression statement sequence #elif expression 1 statement sequence #elif expression 2 statement sequence #elif expression 3 statement sequence #elif expression 4 #elif expression N statement sequence #endif For example, the following fragment uses the value of ACTIVE_COUNTRY to define the currency sign:

#define FRANCE 2 #define ACTIVE_COUNTRY US #if ACTIVE_COUNTRY==US char currency[] = "dollar"; #elif ACTIVE_COUNTRY==ENGLAND char currency[] = "pound"; #else char currency[] = "franc"; #endif

if (size < 1000) return size.ToString() + " KB"; else return (size / 1000).ToString() + " MB"; } return "Bad Param"; }

#ifs and #elifs can be nested When this occurs, each #endif, #else, or #elif is associated with the nearest #if or #elif For example, the following is perfectly valid:

Distance FSO technology performs with exceptional reliability when used over comparatively short distances, something in the order of tens of meters to a few hundred meters However, when used over longer distances, it becomes less reliable during atmospheric events such as fog and heavy rain Therefore, in order to achieve fiber-like reliability, it is necessary for the lengths of FSO links to be fairly short The multihop capability of a mesh network allows the lengths of FSO links to be maintained at less than a few hundred meters Point-to-multipoint FSO is a point-to-point technology and, therefore, cannot, by itself, provide point-to-multipoint services This shortcoming of FSO is complemented by mesh networking technology, which can offer both point-to-multipoint and multipoint-to-multipoint services Line-of-sight FSO technology is a line-of-sight technology Therefore, FSO by itself cannot be used to offer its high capacity network services to a location not in line-of-sight of a POP However, mesh networks enable delivery of services to locations that are not in direct line-of-sight of the POP Failure resiliency All communications systems are prone to failure and FSO links are no exception Because of its line-of-sight requirements, any event that could rob an FSO link of its line-of-sight would disrupt the link This limitation is complemented by the redundancy inherent in mesh networks

#if MAX>100 #if SERIAL_VERSION int port = 198; #elif int port = 200; #endif #else char out_buffer[100]; #endif

In C++ Builder, you can use the sizeof compile-time operator in an #if statement For example, the next fragment determines whether a program is being compiled for a small or large arrays