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Listing 11-23. A Simple ref class Template // managed_template.h template <typename T> public ref class CTemplate { T m_obj; public: CTemplate(T obj) { m_obj = obj; } property T InnerObject { T get() { return m_obj; } void set(T obj) { m_obj = obj; } } }; The template is instantiated just as we would normally instantiate a native template class. In Listing 11-24, we instantiate the type with an int and, separately, a String handle. Listing 11-24. Using a Template with Different Types // managed_templates.cpp #include "managed_template.h" using namespace System; int main() { CTemplate<int>^ ct_int; CTemplate<String^>^ ct_string; ct_int = gcnew CTemplate<int>(55); ct_string = gcnew CTemplate<String^>("test"); Console::WriteLine("{0} ", ct_int->InnerObject ); Console::WriteLine("{0} ", ct_string->InnerObject ); } In a similar manner, you can use all the other features of templates on your managed reference types, interfaces, and value types. Some managed types cannot be templates: you cannot declare template enum classes or delegate types. Otherwise, you can use nontype template parameters, you can use template functions, you can use template arguments, partial specialization, and so on.

Using this loop is an easy solution to the freezing problem, but a better solution would be to use coding strategies that avoid the problem altogether. For example, you can use idle functions, which will be covered in 6, to call a function only when there are no actions of greater importance to process.

In your coding, you have probably already encountered the foreach operator. However, you might not have known that you were using the Iterator pattern when employing foreach. With the release of .NET 2.0, an interesting new mechanism has been added to make it possible to easily implement the Iterator pattern.

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The GtkButton widget is a special type of container that turns its child into a clickable entity. It is only capable of holding one child. However, that child can be a container itself, so the button can theoretically be the ancestor of large amounts of children. This allows the button to hold, for example, a label and an image at the same time. Because the purpose of a GtkButton widget is to make the child clickable, you will almost always need to use the clicked signal to get notification of when the button is activated. You will use this signal in the following example. The GtkButton widget is usually initialized with gtk_button_new_with_label(), which creates a new button with a GtkLabel as its child. If you want to create an empty GtkButton and add your own child at a later time, you can use gtk_button_new(), although this is not what you will want to do in most cases. Figure 2-4 shows a button with mnemonic capabilities. You can recognize a mnemonic label by the underlined character. In the case of the button below, when Alt+C is pressed, the button will be clicked.

However, let s perform a little experiment with the template class in Listing 11-24 to illustrate an important limitation of managed templates: let s compile the template in two different assemblies. We ll also create some functions that take arguments of the specialized template types, so you can see what happens when we try to pass these template class types over an assembly boundary. We ll create two assemblies that include the managed template header file. One, compiled from assembly1.cpp (see Listing 11-25), will expose a class, CBridge, with a public static function that takes the template as a parameter. First, compile assembly1.cpp as an executable, then compile it as a library; and compile assembly2.cpp, which references assembly1.dll and tries to call the public static method CBridge::F, passing assembly2.cpp s instantiation of the managed template. Listing 11-25. An Assembly That Uses a Template Type in Its Public Interface // assembly1.cpp #include "managed_template.h" using namespace System; public ref class CBridge { public: static void F(CTemplate<int>^ ct_int) { Console::WriteLine("{0} ", ct_int->InnerObject ); } }; int main() { CTemplate<int>^ ct_int; ct_int = gcnew CTemplate<int>(55); CBridge::F(ct_int); } Compile the code in Listing 11-25 as a DLL: cl /clr /LD assembly2.cpp Listing 11-26 is assembly2.cpp. Listing 11-26. Trying to Use the Template in Another Assembly // assembly2.cpp #include "managed_template.h" #using "assembly1.dll"

Figure 2-4. A GtkButton widget with a mneumonic label The function gtk_button_new_with_mnemonic() will initialize a new button with mnemonic label support. When the user presses the Alt key along with the specified accelerator key, the button will be activated. An accelerator is a key or set of keys that can be used to activate a predefined action.

Implementing the Iterator Pattern Using C# 2.0

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