[Vala] Making a class iterable from VAPI bindings

[Calvin Walton <calvin walton kepstin ca>]

Hi everyone.
I'm currently writing up a .vapi file to create bindings for the
libmusicbrainz4 library's C interface (download at
http://musicbrainz.org/doc/libmusicbrainz - online documentation at
http://users.musicbrainz.org/~luks/docs/libmusicbrainz4/mb4__c_8h.html )

It has a list type, which is defined as

typedef void* Mb4ArtistList;
typedef void* Mb4Artist;

int mb4_artist_list_size(Mb4ArtistList l);
Mb4Artist mb4_artist_list_item(Mb4ArtistList l, int i);
...

Right now, my bindings for this look like

[CCode (cheader_filename = "musicbrainz4/mb4_c.h")]
namespace Mb4 {
        [Compact]
        public class ArtistList {
                [CCode (cname = "mb4_artist_list_item")]
                public unowned Artist? get(int item);
                public int length {
                        [CCode (cname = "mb4_artist_list_size")]
                        get;
                }
        }
}

which seems to work, allowing it to be accessed like an array
(artist_list[2] and artist_list.length work). But I can't use it with
the foreach loop, because it doesn't have an iterator method - even
though you can use foreach on an array. I assume this is special cased?

Is there any way to add an iterator class to my .vapi file so I can use
foreach, or any plans to allow foreach on types which provide a length
property and get(index) method?

-- 
Calvin Walton <calvin walton kepstin ca>