From 03a68165d8296ed5cc0eb2434500381419409e79 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 7 May 2019 00:03:35 -0700
Subject: [PATCH] [meta] Add hb_reference_wrapper<>

Functionality kinda superset of std:: counterpart.
---
 src/hb-meta.hh | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/hb-meta.hh b/src/hb-meta.hh
index 52f6866..fc64e97 100644
--- a/src/hb-meta.hh
+++ b/src/hb-meta.hh
@@ -138,6 +138,27 @@ struct
 
 } HB_FUNCOBJ (hb_ref);
 
+template <typename T>
+struct hb_reference_wrapper
+{
+  hb_reference_wrapper (T v) : v (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; }
+  T v;
+};
+template <typename T>
+struct hb_reference_wrapper<T&>
+{
+  hb_reference_wrapper (T& v) : v (&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; }
+  T* v;
+};
+
 
 template <bool B, typename T = void> struct hb_enable_if {};
 template <typename T>                struct hb_enable_if<true, T> { typedef T type; };
-- 
2.7.4