On Sat, May 12, 2007 at 02:42:50PM +0800, Kuang-Chun Cheng wrote: > On 5/12/07, Jean Br*fort <[1]jean.brefort@xxxxxxxxxxxxxx> wrote: .... > > A GObject class can inherit from only one parent (which might be > virtual), but you can add as many Interfaces as you like. It is somewhat > similar to multiple inheritance in C++ (more like the D language > actually). > > Hi Jean, > > That's new to me ... I did not catch up this from GObject Ref. Manual ... > Thanks. > > KC It's also important to note that GTK+ Interfaces cannot directly implement any functionality, unlike C++ classes. They only specify the set of (rigid) "prototypes" that *must* be fully implemented by the implementing class. Interfaces also define a "type" which the implementing class must be cast-to in order to call the interface methods. In C++, an analogous situation would be implementing a pure virtual class (containing *only* pure virtual methods), which can be used in single or multiple inheritance. The GTK+ inheritance model is much more like Java than C++; with only single inheritance allowed, but no limit on the number of Interfaces which may be implemented. (much better than C++ imho.) I recommend you read about Java interfaces. - Ana _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
