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Algorithms act on containers They provide the means by which you will manipulate the contents of containers Their capabilities include initializing, sorting, searching, and transforming the contents of containers Many algorithms operate on a range of elements within a container

The DataView class in the System.Data namespace implements this interface, allowing a data grid to update its contents when the underlying database is modified. The DataRowView class is a customized view of a row that supports transactional changes to the elements of the row. The DataRowView class supports this interface as well in order to provide appropriate feedback in a DataGrid control when an error occurs.

Iterators are objects that act, more or less, like pointers They give you the ability to cycle through the contents of a container in much the same way that you would use a pointer to cycle through an array There are five types of iterators:

The feature applies to variables and classes as well. As another example, when you begin typing the next line to set the Title property of the dialog box, you may see something like figure 2.4. Here Visual Studio displays the class properties, methods, and events available to the dlg variable. These correspond to the members of the OpenFileDialog class. Once again note how Visual Studio uses different icons for different types. In the figure, ShowDialog is a method and Title is a property. You can scroll through the dialog to locate an event such as Disposed or FileOk in order to see its icon. You will notice other statement completion popups as you type as well. One particularly nice feature is that signatures of methods are displayed as you type, and you can step through the various overloaded versions of a method using the arrow keys. In addition, as you will see in chapter 5, Visual Studio automatically picks up the classes and structures defined in your solution and incorporates them into these popup menus. Any documentation provided by <summary> tags within these classes is included as well, providing an automated forum for conveying important comments about a particular member to other programmers.

Store and retrieve values Elements may be accessed randomly Store and retrieve values Forward and backward moving Store and retrieve values Forward moving only Retrieve, but not store, values Forward moving only Store, but not retrieve, values Forward moving only

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In general, an iterator that has greater access capabilities can be used in place of one that has lesser capabilities For example, a forward iterator can be used in place of an input iterator Iterators are handled just like pointers You can increment and decrement them You can apply the * operator to them Iterators are declared using the iterator type defined by the various containers The STL also supports reverse iterators Reverse iterators are either bidirectional or random-access iterators that move through a sequence in the reverse direction Thus, if a reverse iterator points to the end of a sequence, incrementing that iterator will cause it to point one element before the end

Figure 2.4 An example of statement completion for a class variable after typing the letter T for an OpenFileDialog class instance. Notice the small popup indicating that Title is declared as a string property in the FileDialog class.

When referring to the various iterator types in template descriptions, this book will use the following terms

Of course, like any feature, all these popup windows require a certain amount of CPU and system resources. If you are running Visual Studio on a slower machine, or do not want such windows popping up, you can turn statement completion off in the Options dialog box. Click the Options item under the top-level Tools menu to display this dialog. Click the Text Editor settings, select the C# item, followed by the General item. This dialog is shown in figure 2.5. As you can see in the figure, you can disable the automatic listing of members, the display of parameter information, or both of these features. Other option settings are available here as well, of course. Feel free to look around and use the ever-ready Help button for any questions you may have.