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Each server-facing port in the client cloud is configured with different root bridge information Presumably, with two links available, you would configure one such port with a very high priority root for one spanning tree and a not-quite-so-high priority root for the other VLANs, and the other server-facing port would be configured in an opposite manner As the spanning tree operates normally in the client cloud, the port that has the best claim becomes a root port and goes into the forwarding state When that information propagates to any other server-facing port, one that has a second- or third-best claim, that port becomes a designated port and is blocked Thus, exactly one of the server-facing ports is in the forwarding state for any given spanning tree In the event of the failure of either one of the links or bridges, one of the secondary ports becomes the root port This happens almost instantaneously if the client cloud is a single bridge, and it happens through the normal spanning tree operations if it is a cloud of bridges Either way, there is no possibility of temporary loops When the link or bridge recovers, then normal operation resumes

void road_vehicle::set_pass(int num) { passengers = num; } int road_vehicle::get_pass() { return passengers; } void truck::set_cargo(int num) { cargo = num; } int truck::get_cargo() { return cargo;

directly from within your browser. This is sort of like using ActiveX controls; you can have arbitrary code be downloaded and executed on the client machine inside

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} void truck::show() { cout << "Wheels: " << get_wheels() << "\n"; cout << "Passengers: " << get_pass() << "\n"; cout << "Cargo capacity in cubic feet: " << cargo << "\n"; } void automobile::set_type(enum type t) { car_type = t; } enum type automobile::get_type() { return car_type; } void automobile::show() { cout << "Wheels: " << get_wheels() << "\n"; cout << "Passengers: " << get_pass() << "\n"; cout << "Type: "; switch(get_type()) { case van: cout << "Van\n"; break; case car: cout << "Car\n"; break; case wagon: cout << "Wagon\n"; } } int main() { truck t1, t2; automobile c; t1set_wheels(18); t1set_pass(2); t1set_cargo(3200);

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the browser. The key difference is that, unlike ActiveX, .NET has a robust security model, so it s possible to control what an XBAP is allowed to do. The ActiveX security model had two modes don t allow or (as one of our colleagues describes it) party on your hard drive. As it happens, the ability to run .NET code within a browser has been around for a while, but WPF makes it much easier to create and deploy apps. It s even possible for a browser to automatically render loose XAML files. In this chapter, we ll take our dictionary application, host it inside a browser, and tackle some of the security issues. While we re at it, we ll also demonstrate some features of navigation applications that lend themselves to being hosted within a browser.

t2set_wheels(6); t2set_pass(3); t2set_cargo(1200); t1show(); t2show(); cset_wheels(4); cset_pass(6); cset_type(van); cshow(); return 0; }

As this program illustrates, the major advantage of inheritance is that you can create a base classification that can be incorporated into more specific classes In this way, each object can represent its own classification precisely Notice that both truck and automobile include member functions called show( ), which display information about each object This is another aspect of polymorphism Since each show( ) is linked with its own class, the compiler can easily tell which one to call in any circumstance

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It is not unusual for some part of an object to require initialization before it can be used For example, think back to the queue class developed earlier in this chapter Before queue could be used, the variables rloc and sloc had to be set to 0 using the function init( ) Because the requirement for initialization is so common, C++ allows objects to initialize themselves when they are created This automatic initialization is performed through the use of a constructor A constructor is a special function that is a member of a class and has the same name as that class For example, here is how the queue class looks when converted to use a constructor function for initialization:

ClickOnce is another technology that has been around for a while with .NET, but has been improved. ClickOnce is a deployment technology for automatically shipping out and then updating your applications. The user goes to a website and clicks a link for your application. Unlike XBAP, the application isn t hosted in the browser, but runs as a free-standing application. ClickOnce can even set up desktop icons to run your application again without going to the website. It will also detect changes from that website and automatically download newer versions as they become available. Almost all the caveats of XBAP exist for ClickOnce as well, although ClickOnce does have the ability to install .NET if required. It does the install via the use of an ActiveX control, so this may not be the best choice in a security-conscious environment.