From b5f621b08d56c15832ab4f588a0673fce03305a0 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sun, 5 Jun 2022 07:52:51 -0600
Subject: [PATCH] [cplusplus] Internally allow using hb_unique_ptr with
 hb_free()

...for arbitrary types.
---
 src/hb.hh | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/hb.hh b/src/hb.hh
index 14872e2a4..b96a1b735 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -466,10 +466,23 @@ static_assert ((sizeof (hb_mask_t) == 4), "");
 static_assert ((sizeof (hb_var_int_t) == 4), "");
 
 
+#include "hb-cplusplus.hh"
+
+namespace hb {
+
+// Allow using hb::unique_ptr with hb_free() internally.
+template <typename T>
+struct vtable
+{
+  static constexpr auto destroy = hb_free;
+};
+
+}
+
+
 /* Headers we include for everyone.  Keep topologically sorted by dependency.
  * They express dependency amongst themselves, but no other file should include
  * them directly.*/
-#include "hb-cplusplus.hh"
 #include "hb-meta.hh"
 #include "hb-mutex.hh"
 #include "hb-number.hh"