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As with all of the containers, you can use a map to store objects of types that you create For example, the next program creates a simple phone directory That is, it creates a map of names with their numbers To do this, it creates two classes called name and number Since a map maintains a sorted list of keys, the program also defines the < operator for objects of type name In general, you must define the < operator for any classes that you

will use as the key You may also need to implement other comparison operators, depending upon what elements of the STL you will be using (and for maximum portability)

The Expander control Earlier, we suggested that one place to use a StackPanel is with expanding panels when the panels expand or contract, everything else Figure 4.18 Setting the vertical scrollbar s visibility changes size automatically. The WPF team has been nice enough to provide an expanding/contracting control which makes this behavior easy to demonstrate. (We assume they put it in for the convenience of the

Ethernet OAM Technically, the Ethernet OAM (notably IEEE 8021ag) is not yet ratified; once this is finalized, OAM functionality will be more widely incorporated in products Ethernet in WAN The MEF has begun work on ensuring Ethernet is viable deeper in the Service Provider networks This will greatly guide the deployment of Ethernet beyond the MAN/access where it is largely concentrated Provider Backbone Bridge (PBB) This is the IEEE 8021ah standard (currently underway) that enables a MAC-in-MAC encapsulation Basically, this creates separate customer and Service Provider domains by encapsulating customer/ end user MAC addresses with Service Provider based MAC addresses This approach will remove the scaling limitations traditionally posed by Ethernet, and extend the number of service instances from over 4K to several million Provider Backbone Bridging Transport Engineering (PBB-TE) The IEEE 8021Qay standard is addressing PBB-TE, which is focused on providing Point-to-Point Ethernet tunnels across a metro and beyond These connections will ensure a solid QoS and effectively simulate a circuit switched path, and are

// Use a map to create a phone directory #include <iostream> #include <map> #include <cstring> using namespace std; class name { char str[40]; public: name() { strcpy(str, ""); } name(char *s) { strcpy(str, s); } char *get() { return str; } }; // Must define less than relative to name objects bool operator<(name a, name b) { return strcmp(aget(), bget()) < 0; } class phoneNum { char str[80]; public: phoneNum() { strcmp(str, ""); } phoneNum(char *s) { strcpy(str, s); } char *get() { return str; } };

int main() { map<name, phoneNum> directory; // put names and numbers into map directoryinsert(pair<name, phoneNum>(name("Tom"), phoneNum("555-4533")));

authors of this book.) The Expander control works similarly to the sections in Windows Explorer that allow you to show or hide different sections. Figure 4.19 shows our sample with an Expander bar added. We put a thick border around the Expander so it would be easier to see. Also notice that, as well as moving everything down, we got our automatic scrollbar after expanding. Listing 4.9 shows the XAML for the Expander.

27:

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directoryinsert(pair<name, phoneNum>(name("Chris"), phoneNum("555-9678"))); directoryinsert(pair<name, phoneNum>(name("John"), phoneNum("555-8195"))); directoryinsert(pair<name, phoneNum>(name("Rachel"), phoneNum("555-0809"))); // given a name, find number char str[80]; cout << "Enter name: "; cin >> str; map<name, phoneNum>::iterator p; p = directoryfind(name(str)); if(p != directoryend()) cout << "Phone number: " << p->secondget(); else cout << "Name not in directory\n"; C++ return 0; }

<ScrollViewer VerticalScrollBarVisibility="Auto"> <StackPanel Orientation="Vertical"> <Button Width="200" >First</Button> Adds <Expander Header="Expand me" Expander BorderThickness="3" BorderBrush="Black"> <StackPanel> <Button>Second</Button> Adds panel in <Button>Third</Button> Expander <Button>Fourth</Button> </StackPanel> </Expander> <Button Padding="10 4" HorizontalAlignment="Right">Fifth</Button> <Button HorizontalAlignment="Stretch">Sixth</Button> </StackPanel> </ScrollViewer>

Enter name: Rachel Phone number: 555-0809

In the program, each entry in the map is a character array that holds a nullterminated string Later in this chapter, you will see an easier way to write this program that uses the standard string type