From 177a8af380738e5be598952adbf275503bb3f5bc Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 7 Jan 2019 20:20:44 -0500
Subject: [PATCH] [array] SFINAE fun

---
 src/hb-array.hh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/hb-array.hh b/src/hb-array.hh
index 5234bee..9247a79 100644
--- a/src/hb-array.hh
+++ b/src/hb-array.hh
@@ -46,6 +46,7 @@ struct hb_array_t :
    */
   hb_array_t () : arrayZ (nullptr), length (0) {}
   hb_array_t (Type *array_, unsigned int length_) : arrayZ (array_), length (length_) {}
+  template <typename U = Type, hb_enable_if (hb_is_const (U))>
   hb_array_t (const hb_array_t<hb_remove_const (Type)> &o) : arrayZ (o.arrayZ), length (o.length) {}
   template <unsigned int length_> hb_array_t (Type (&array_)[length_]) : arrayZ (array_), length (length_) {}
 
@@ -204,6 +205,7 @@ struct hb_sorted_array_t :
 
   hb_sorted_array_t () : hb_array_t<Type> () {}
   hb_sorted_array_t (const hb_array_t<Type> &o) : hb_array_t<Type> (o) {}
+  template <typename U = Type, hb_enable_if (hb_is_const (U))>
   hb_sorted_array_t (const hb_sorted_array_t<hb_remove_const (Type)> &o) : hb_array_t<Type> (o) {}
   hb_sorted_array_t (Type *array_, unsigned int length_) : hb_array_t<Type> (array_, length_) {}
   template <unsigned int length_> hb_sorted_array_t (Type (&array_)[length_]) : hb_array_t<Type> (array_) {}
-- 
2.7.4