Actually make it work

src/hb-iter.hh

@@ -331,6 +331,7 @@ struct hb_map_iter_t :
   void __forward__ (unsigned n) { it += n; }
   void __prev__ () { --it; }
   void __rewind__ (unsigned n) { it -= n; }
+  hb_map_iter_t __end__ () const { return hb_map_iter_t (it.end (), f); }
   bool operator != (const hb_map_iter_t& o) const
   { return it != o.it || f != o.f; }
 
@@ -376,6 +377,7 @@ struct hb_filter_iter_t :
   bool __more__ () const { return bool (it); }
   void __next__ () { do ++it; while (it && !hb_has (p.get (), hb_get (f.get (), *it))); }
   void __prev__ () { --it; }
+  hb_filter_iter_t __end__ () const { return hb_filter_iter_t (it.end (), p, f); }
   bool operator != (const hb_filter_iter_t& o) const
   { return it != o.it || p != o.p || f != o.f; }
 

src/hb-meta.hh

@@ -145,17 +145,19 @@ struct hb_reference_wrapper
   hb_reference_wrapper (const hb_reference_wrapper& o) : v (o.v) {}
   bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
   bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
+  operator T () const { return v; }
   T get () const { return v; }
   T v;
 };
 template <typename T>
 struct hb_reference_wrapper<T&>
 {
-  hb_reference_wrapper (T& v) : v (&v) {}
+  hb_reference_wrapper (T& v) : v (hb_addressof (v)) {}
   hb_reference_wrapper (const hb_reference_wrapper& o) : v (o.v) {}
   bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
   bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
-  T* get () const { return v; }
+  operator T& () const { return *v; }
+  T& get () const { return *v; }
   T* v;
 };