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The Visitor pattern in theory has a major problem in that IVisitor can t be defined in a general fashion in a separate assembly. As per my original Bridge pattern implementation, an interface is implemented. The interface could be defined in one assembly and the implementations in another assembly. The Visitor pattern as Figure 8-2 defines it doesn t allow this. The problem is that IVisitor references types that would be defined in a separate assembly. This causes the interface assembly to reference the implementation assembly, and the implementation

n 1, you were given an overview of the things available to you in the GTK+ libraries as a graphical application developer. In this chapter, you ll learn how to write your own GTK+ applications. While we will begin with simple examples, there are many important concepts presented in this chapter. We will cover the topics that every other GTK+ application you write will rely on. Therefore, as with any chapter, make sure you understand the concepts presented to you in the next few pages before continuing on. In this chapter, you will learn the following: The basic function calls required by all GTK+ applications How to compile GTK+ code with GCC The object-oriented nature of the GTK+ widget system What role signals, callbacks, and events play in your applications How to alter textual styles with the Pango Text Markup Language Various other useful functions provided for the widgets presented in this chapter How to use the GtkButton widget to make a clickable GtkLabel How to get and set properties of objects using GObject methods

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Note that when you dereference an interior pointer, you get the object, just like a regular pointer. If you take the address of an interior pointer, you get a native pointer that is the address that the interior pointer designates. However, it s not a good idea to do that since the native pointer won t necessarily continue to point to the object. Once the garbage collector moves that object around in memory, the address of the object will no longer match the native pointer.

assembly to reference the interface assembly. This is recursive, and thus can t be compiled. Hence both interface and implementation have to be defined in the same assembly. What is possible is the definition of IVisitor interface could be in one assembly, and the implementation of IVisitor could be in another. However, the types referenced in IVisitor then need to be defined with public scope, which defeats the purpose of the Bridge and Factory patterns. There is a way to have your cake and eat it too. The better solution is to use Generics and modify the IVisitor interface to the following: public interface IVisitor { void Process< type>( type parameter) where type : class ; } In the new definition of IVisitor, the method Process has been altered to use a Generic type. The Generic type is the parameter of the type being inspected. Using Generics in this way delegates the responsibility of identifying the type to the implementation of IVisitor. The advantage of this approach is that it s possible to move both IBase and IVisitor to an interfacesonly assembly for reference by an implementations assembly. To demonstrate these principles, I ll show you XML serialization to a stream via a Visitor pattern. The modified SampleClass from the XML serialization example is defined as follows: [XmlRoot("SampleClass")] public class SampleClass : IBase { private int _value; private string _buffer; public SampleClass() { } public SampleClass(int value, string buffer) { _value = value; _buffer = buffer; } [XmlElement( "Value")] public int Value { get { return _value; } set { _value = value; } } [XmlElement( "Buffer")] public string Buffer { get { return _buffer; }

There are three types of array data types provided by GLib, which are used to store pointers, bytes, or arbitrary types of data. There are multiple advantages of using arrays in GLib. First, they provide very fast memory access, because direct indexing is supported. This is because of the fact that the GArray structure holds data in an internal array. Another advantage of GLib array types is that they will automatically expand in size if a new element will not fit. However, you do need to keep in mind that every time you change the number of elements in the array, it can call g_memmove() and memcpy(), which can be expensive if you do this too often. Therefore, GLib arrays are not optimal for applications that will need to constantly add and remove elements.

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