Re: [Vala] Extension Methods

[Yu Feng <rainwoodman gmail com>]

On Fri, 2009-03-20 at 00:09 +0100, Frederik wrote:
> Feng Yu wrote:
> > What about this:
> >
> > public extend class Gtk.Widget {
> >     public bool set_gl_capability (GdkGl.Config glconfig,
> > Gdk.GlContext? share_list, bool direct, int render_type) {
> >
> >       // do stuff.
> >     }
> > }
> >
> > AKA, when vala encounters the extend keyword, instead of panicing
> > duplicated class declarations, it simply add the decleration to the
> > existing class.
>
> 'extend' could be confused with subclassing (for example Java uses the
> 'extends' keyword for subclassing).
>
> I know this feature from Objective C, where it's called "categories":
> http://en.wikipedia.org/wiki/Objective_c#Categories
>
> These 'categories' are even named, so you can group these additional
> methods thematically. If Vala considers such a feature I would propose
> the following syntax:
>
>  public class string category SpellChecking {
>      // ...
>  }
>
>  public class Gtk.Widget category GLFunctionality {
>      public bool set_gl_capability (...) {
>          // do stuff.
>      }
>      // ...
>  }
>
> These category names would get lost in C code, but they could be nice
> additional information in a Vala object browser.

Yes I'm loving it. Let's file a bugzilla for it.




> Regards,
>
> Frederik
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