externals: Update boost to 1.72 and add Boost Context

boost/thread/detail/lockable_wrapper.hpp

@@ -0,0 +1,45 @@
+// 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)
+// (C) Copyright 2012 Vicente J. Botet Escriba
+
+#ifndef BOOST_THREAD_DETAIL_LOCKABLE_WRAPPER_HPP
+#define BOOST_THREAD_DETAIL_LOCKABLE_WRAPPER_HPP
+
+#include <boost/thread/detail/config.hpp>
+
+#if ! defined BOOST_THREAD_NO_CXX11_HDR_INITIALIZER_LIST
+#include <initializer_list>
+#endif
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+
+#if ! defined BOOST_THREAD_NO_CXX11_HDR_INITIALIZER_LIST
+  namespace thread_detail
+  {
+    template <typename Mutex>
+    struct lockable_wrapper
+    {
+      Mutex* m;
+      explicit lockable_wrapper(Mutex& m_) :
+        m(&m_)
+      {}
+    };
+    template <typename Mutex>
+    struct lockable_adopt_wrapper
+    {
+      Mutex* m;
+      explicit lockable_adopt_wrapper(Mutex& m_) :
+        m(&m_)
+      {}
+    };
+  }
+#endif
+
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif // header