From e95946831f8ef53d29590735a2df661385edb008 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 6 Aug 2018 10:35:22 +0200
Subject: Replace boost by the standalone asio library

---
 lib/asio/detail/std_fenced_block.hpp | 62 ++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 lib/asio/detail/std_fenced_block.hpp

(limited to 'lib/asio/detail/std_fenced_block.hpp')

diff --git a/lib/asio/detail/std_fenced_block.hpp b/lib/asio/detail/std_fenced_block.hpp
new file mode 100644
index 0000000..0d8ade0
--- /dev/null
+++ b/lib/asio/detail/std_fenced_block.hpp
@@ -0,0 +1,62 @@
+//
+// detail/std_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_STD_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_STD_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_STD_ATOMIC)
+
+#include <atomic>
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class std_fenced_block
+  : private noncopyable
+{
+public:
+  enum half_t { half };
+  enum full_t { full };
+
+  // Constructor for a half fenced block.
+  explicit std_fenced_block(half_t)
+  {
+  }
+
+  // Constructor for a full fenced block.
+  explicit std_fenced_block(full_t)
+  {
+    std::atomic_thread_fence(std::memory_order_acquire);
+  }
+
+  // Destructor.
+  ~std_fenced_block()
+  {
+    std::atomic_thread_fence(std::memory_order_release);
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_STD_ATOMIC)
+
+#endif // ASIO_DETAIL_STD_FENCED_BLOCK_HPP
-- 
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