From 68f470fdda4e31d7704fba3e41bb2f899db39541 Mon Sep 17 00:00:00 2001
From: Ivo van Dongen <info@ivovandongen.nl>
Date: Tue, 8 Aug 2017 10:42:44 +0300
Subject: [core] make actor self reference optional - again

- uses a different method of constructor selection that also works on Apple clang < 8.2.
---
 include/mbgl/actor/actor.hpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'include')

diff --git a/include/mbgl/actor/actor.hpp b/include/mbgl/actor/actor.hpp
index 6610421eb5..a0df19208e 100644
--- a/include/mbgl/actor/actor.hpp
+++ b/include/mbgl/actor/actor.hpp
@@ -50,13 +50,18 @@ class Actor : public util::noncopyable {
 public:
 
     // Enabled for Objects with a constructor taking ActorRef<Object> as the first parameter
-    template <typename U = Object, class... Args,
-            typename std::enable_if<std::is_constructible<U, ActorRef<Object>, Args...>::value>::type...>
+    template <typename U = Object, class... Args, typename std::enable_if<std::is_constructible<U, ActorRef<U>, Args...>::value>::type * = nullptr>
     Actor(Scheduler& scheduler, Args&&... args_)
             : mailbox(std::make_shared<Mailbox>(scheduler)),
               object(self(), std::forward<Args>(args_)...) {
     }
 
+    // Enabled for plain Objects
+    template<typename U = Object, class... Args, typename std::enable_if<!std::is_constructible<U, ActorRef<U>, Args...>::value>::type * = nullptr>
+    Actor(Scheduler& scheduler, Args&& ... args_)
+            : mailbox(std::make_shared<Mailbox>(scheduler)), object(std::forward<Args>(args_)...) {
+    }
+
     ~Actor() {
         mailbox->close();
     }
-- 
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