From 56d8e429a2b4d7bc6a18f57f1db6656f596af9a4 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 26 Oct 2016 10:34:58 -0700
Subject: [PATCH] ircd::js: Add pointer_value() to store external host pointers
 in JS::Value.

---
 include/ircd/js/value.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/include/ircd/js/value.h b/include/ircd/js/value.h
index dd6b721ba..9a8d49a30 100644
--- a/include/ircd/js/value.h
+++ b/include/ircd/js/value.h
@@ -25,6 +25,11 @@
 namespace ircd {
 namespace js   {
 
+// Use Value to carry a non-gc host pointer value
+template<class T> T *pointer_value(const JS::Value &);
+JS::Value pointer_value(const void *const &);
+JS::Value pointer_value(void *const &);
+
 struct value
 :JS::Rooted<JS::Value>
 {
@@ -322,5 +327,27 @@ undefined(const value &val)
 	return type(val) == JSTYPE_VOID;
 }
 
+inline JS::Value
+pointer_value(const void *const &ptr)
+{
+	return pointer_value(const_cast<void *>(ptr));
+}
+
+inline JS::Value
+pointer_value(void *const &ptr)
+{
+	JS::Value ret;
+	ret.setPrivate(ptr);
+	return ret;
+}
+
+template<class T>
+T *
+pointer_value(const JS::Value &val)
+{
+	const auto ret(val.toPrivate());
+	return reinterpret_cast<T *>(ret);
+}
+
 } // namespace js
 } // namespace ircd