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Unconstrained type parameters can be either reference types or value types, and the same constructs will work appropriately for either When an assignment occurs in the generic type, if it s a value type, the value is copied, but if it s a reference type, the reference, not the value, is copied In some cases, however, you will want to write an algorithm that assumes the semantics of one or the other Perhaps your algorithm copies and then destroys or destructively modifies objects so it either wouldn t work or would corrupt any reference types that are used It is possible to constrain a type parameter such that it may only be a value type, or only a reference type, if needed The syntax is show in Listing 11-14 Listing 11-14 Using Value Type Constraints // valuetype_constraint.

scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_container_add (GTK_CONTAINER (scrolled_win), textview); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win), GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS); hbox = gtk_hbox_new (FALSE, 5); gtk_box_pack_start (GTK_BOX (hbox), scrolled_win, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, TRUE, 0); gtk_container_add (GTK_CONTAINER (window), hbox); gtk_widget_show_all (window);

public class Item { private Item _next = null; public Item() { } public Item( Item next) { _next = next; } public bool Unread = true; public void MarkAsRead() { if( _next != null) { _nextMarkAsRead(); } Unread = false; } } public class Channel { public Item _items; }.

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gtk_main(); return 0; } /* Retrieve the tag from the "tag" object data and apply it to the selection. */ static void format (GtkWidget *widget, GtkTextView *textview) { GtkTextIter start, end; GtkTextBuffer *buffer; gchar *tagname; tagname = (gchar*) g_object_get_data (G_OBJECT (widget), "tag"); buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_get_selection_bounds (buffer, &start, &end); gtk_text_buffer_apply_tag_by_name (buffer, tagname, &start, &end); } /* Apply the selected text size property as the tag. */ static void scale_changed (GtkComboBox *combo, GtkTextView *textview) { const gchar *text; if (gtk_combo_box_get_active (combo) == -1) return; text = gtk_combo_box_get_active_text (combo); g_object_set_data (G_OBJECT (combo), "tag", (gpointer) text); format (GTK_WIDGET (combo), textview); gtk_combo_box_set_active (combo, -1); } /* Remove all of the tags from the selected text. */ static void clear_clicked (GtkButton *button, GtkTextView *textview) { GtkTextIter start, end; GtkTextBuffer *buffer;

cpp generic <typename T> where T : value class ref class G { /* .. */ }; As an example, suppose the List generic class removes nodes The question you face when creating a collection class that deletes nodes is what to do with the objects when the node is deleted If the collection uses a reference type as an argument, and it merely references the objects, but doesn t own them, it s fine to remove the references in the nodes If the collection is considered to own the object, it might need to delete the object to make sure the destructor is called, perhaps to free up some scarce resource such as a database connection But if you do that, you have to worry about whether any other references to that object are being held so that you don t destroy an object that s being used.

buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_get_selection_bounds (buffer, &start, &end); gtk_text_buffer_remove_all_tags (buffer, &start, &end); } When you create a text tag, you normally have to add it to a GtkTextBuffer s tag table, an object that holds all of the tags available to a text buffer You can create a new GtkTextTag object with gtk_text_tag_new() and then add it to the tag table However, you can do this all in one step with gtk_text_buffer_create_tag() GtkTextTag* gtk_text_buffer_create_tag (GtkTextBuffer *buffer, const gchar *tag_name, const gchar *first_property_name, ..); The first two parameters of the function allow you to specify the text buffer to whose tag table the GtkTextTag will be added and a name to give the text tag This name can be used to reference a tag for which you do not have the GtkTextTag object anymore The next set of parameters is a NULL-terminated list of GtkTextTag style properties and their values.

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