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When you include a modern C++ header in your program, the contents of that header are contained in the std namespace As mentioned, a namespace is simply a declarative region The purpose of a namespace is to localize the names of identifiers to avoid name collisions Elements declared in one namespace are separate from elements declared in another Originally, the names of the C++ library functions, etc, were simply put into the global namespace (as they are in C) However, with the advent of the ANSI/ISO C++ standard and the modern-style headers, the contents of the headers are in the std namespace We will look at namespaces in detail later in this book For now, you won t need to worry about them because the statement

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20:

In the OnLoaded method d, we re adding a list of supported dictionaries into the ComboBox on the page In the full version of the application (available on our website at wwwmanningcom/feldman2), we shove a helper object in with friendly names for the dictionaries, but to save space we re using the somewhat cryptic names that we need to pass to the dictionary service Then we select the current dictionary e Finally, we return the selected value to the calling page by using the OnReturn() method f OnReturn takes an instance of a ReturnEventArgs generic instance one specific to the expected return type, which is string for us The OnReturn method does all the work of returning to the previous page and firing an event on that page to let it know what has happened.

structure As an example, this class defines a type called queue, which will be used to implement a queue:

// This creates the class queue class queue { int q[100]; int sloc, rloc; public: void init(); void qput(int i); int qget(); };

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We do the same thing for the Cancel button, except we pass back null to indicate that the user canceled g Now that we have the page, we need to call it..

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A class can contain private as well as public parts By default, all items defined in the class are private For example, the variables q, sloc, and rloc are private, meaning they cannot be accessed by any function that is not a member of the class This is how encapsulation is achieved access to certain items of data is tightly controlled by keeping them private Although not shown in this example, you can also define private functions, which can only be called by other members of the class To make parts of a class public (accessible to other parts of your program), you must declare them after the public keyword All variables or functions defined after public are accessible by all other functions in the program Generally, the rest of your program accesses an object through its public functions Although you can have public variables, you should try to limit or eliminate their use Instead, you should make all data private and control access to it through public functions Thus, public functions provide the interface to your class s private data This helps preserve encapsulation One other point: Notice that the public keyword is followed by a colon The functions init( ), qput( ), and qget( ) are called member functions because they are part of the class queue The variables sloc, rloc, and q are called member variables (or data members) Only member functions have access to the private members of the class in which they are declared Thus, only init( ), qput( ), and qget( ) have access to sloc, rloc, and q Once you have defined a class, you can create an object of that type using the class name In essence, the class s name becomes a new data type specifier For example, this code creates an object called intqueue of type queue:.

16.3.2 Calling a page function We need a method to be called to activate our function. For simplicity, we ve added another hyperlink next to the Help link at the bottom of the page, inside the TextBlock, except, instead of navigating, it calls a method when it s clicked. The XAML looks like this:

queue intqueue;