diff --git a/src/hb-iter.hh b/src/hb-iter.hh
index 61e05180b..04d09940a 100644
--- a/src/hb-iter.hh
+++ b/src/hb-iter.hh
@@ -324,6 +324,16 @@ struct hb_is_sink_of
 	(hb_is_source_of(Iter, Item) && Iter::is_sorted_iterator)
 
 
+struct
+{
+  template <typename Iterable,
+	    hb_requires (hb_is_iterable (Iterable))>
+  unsigned operator () (const Iterable &_) const { return hb_len (hb_iter (_)); }
+
+  unsigned operator () (unsigned _) const { return _; }
+}
+HB_FUNCOBJ (hb_len_of);
+
 /* Range-based 'for' for iterables. */
 
 template <typename Iterable,
diff --git a/src/hb-open-type.hh b/src/hb-open-type.hh
index 3f2c333f8..686099cee 100644
--- a/src/hb-open-type.hh
+++ b/src/hb-open-type.hh
@@ -1249,16 +1249,6 @@ struct VarSizedBinSearchArrayOf
 template <typename COUNT>
 struct CFFIndex
 {
-  struct length_f_t
-  {
-    template <typename Iterable,
-	      hb_requires (hb_is_iterable (Iterable))>
-    unsigned operator () (const Iterable &_) const { return hb_len (hb_iter (_)); }
-
-    unsigned operator () (unsigned _) const { return _; }
-  }
-  HB_FUNCOBJ (length_f);
-
   unsigned int offset_array_size () const
   { return offSize * (count + 1); }
 
@@ -1325,7 +1315,7 @@ struct CFFIndex
       for (const auto &_ : +it)
       {
 	set_offset_at (i++, offset);
-	offset += length_f (_);
+	offset += hb_len_of (_);
       }
       set_offset_at (i, offset);
     }
@@ -1338,7 +1328,7 @@ struct CFFIndex
 	  for (const auto &_ : +it)
 	  {
 	    *p++ = offset;
-	    offset += length_f (_);
+	    offset += hb_len_of (_);
 	  }
 	  *p = offset;
 	}
@@ -1349,7 +1339,7 @@ struct CFFIndex
 	  for (const auto &_ : +it)
 	  {
 	    *p++ = offset;
-	    offset += length_f (_);
+	    offset += hb_len_of (_);
 	  }
 	  *p = offset;
 	}
@@ -1360,7 +1350,7 @@ struct CFFIndex
 	  for (const auto &_ : +it)
 	  {
 	    *p++ = offset;
-	    offset += length_f (_);
+	    offset += hb_len_of (_);
 	  }
 	  *p = offset;
 	}
@@ -1371,7 +1361,7 @@ struct CFFIndex
 	  for (const auto &_ : +it)
 	  {
 	    *p++ = offset;
-	    offset += length_f (_);
+	    offset += hb_len_of (_);
 	  }
 	  *p = offset;
 	}
@@ -1397,7 +1387,7 @@ struct CFFIndex
 
     unsigned total = 0;
     for (const auto &_ : +it)
-      total += length_f (_);
+      total += hb_len_of (_);
 
     if (data_size) *data_size = total;