Example: Insert, before

public static int main (string[] args) {
SList<string> list = new SList<string> ();
list.append ("1. entry");
list.append ("3. entry");

unowned SList<string> list3 = list.nth (1);
list.insert_before (list3, "2. entry");

// Out:
// ´´1. entry´´
// ´´2. entry´´
// ´´3. entry´´
foreach (string str in list) {
print ("%s\n", str);
}

return 0;
}

 valac --pkg glib-2.0 GLib.SList.insert_before.vala

See: