From ceec74f52ff74876dcce9470d8f474b013783480 Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Thu, 28 Feb 2019 16:55:08 +0200
Subject: [core] peer must not wrap itself

---
 include/mbgl/util/peer.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/mbgl/util/peer.hpp b/include/mbgl/util/peer.hpp
index d56526b80d..d16efddb57 100644
--- a/include/mbgl/util/peer.hpp
+++ b/include/mbgl/util/peer.hpp
@@ -12,7 +12,9 @@ public:
     peer() noexcept : storage(nullptr, noop_deleter) {}
 
     template <class T>
-    peer(T&& value) noexcept : storage(new std::decay_t<T>(std::forward<T>(value)), cast_deleter<std::decay_t<T>>) {}
+    peer(T&& value) noexcept : storage(new std::decay_t<T>(std::forward<T>(value)), cast_deleter<std::decay_t<T>>) {
+        static_assert(!std::is_same<peer, std::decay_t<T>>::value, "Peer must not wrap itself.");
+    }
 
     bool has_value() const noexcept { return static_cast<bool>(storage); }
 
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