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The extern keyword is a necessary part of the linkage specification Further, the linkage specification must be global; it cannot be used inside a function You can specify more than one function at a time by using this form of the linkage specification: extern "language " { prototypes } Linkage specifications are rare; you will probably not need to use one

Eventing in WPF was obviously influenced by the web, and is much richer than the traditional Win32/WinForms model. In a traditional WinForms event, only explicit subscribers are notified when an event is fired. If you want to pass a standard event on, you must write specific code to do so. WPF introduces a new type of .NET event called a routed event. Like the web event model, routed events can automatically tunnel down and bubble up the visual tree. As compared with the OO parent-child relationship through class definitions, the visual tree describes the parent-child relationship of controls as composed in the UI. Figure 3.5 shows the path of events bubbling and tunneling through a hierarchy of controls. To discuss routed events, we must clarify the difference between implementation inheritance relationships and compositional relationships. In figure 3.5, the Button is the child of the DockPanel, which is the child of the Grid. In this case, the relationship described by the visual tree describes how the event will propagate. Contrast this to how an event is handled in a class hierarchy, where the Button may override the parent (superclass) control s event handler. In effect, you must think about events both from a classic inheritance perspective, as well as from a compositional approach. The three types of routed events in WPF are:

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The * and ->* are called pointer-to-member operators Their job is to allow you to point to a member of a class, generically, rather than to a specific instance of that member within some object These two operators are needed because a pointer to a member does not fully define an address Instead, it provides an offset at which that member can be found within any object of its class Since member pointers are not true pointers, the normal and -> operators cannot be used Instead, the * and ->* operators must be employed Let s begin with an example The following program displays the summation of the number 7 It accesses the function sum_it( ) and the variable sum using member pointers

#include <iostream> using namespace std; class myclass { public: int sum; void myclass::sum_it(int x); }; void myclass::sum_it(int x) { int i; sum = 0; for(i=x; i; i--) sum += i; } int main() { int myclass::*dp; // pointer to an integer class member void (myclass::*fp)(int x); // pointer to member function myclass c; dp = &myclass::sum; // get address of data fp = &myclass::sum_it; // get address of function (c*fp)(7); // compute summation of 7 cout << "summation of 7 is " << c*dp; return 0; }

Figure 3.5 Routed events may bubble and tunnel through the visual tree. In this example, an event starts at the Grid and tunnels the events down to the Button, and the Button bubbles the events back up to the DockPanel and then the Grid.

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of robustness Not only can a system do this on a per-endstation basis but also on a per-service basis For example, a BS can use higher throughput coding and modulation to communicate with an SS located at 1 km but use higher robustness (but lower throughput) modulation to communicate with an SS located at 10 km Alternately, even for an SS located at 1 km, it may use higher robustness modulation for services that require more protection than throughput, like MAC management traffic