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diff --git a/src/third_party/boost-1.60.0/boost/thread/detail/singleton.hpp b/src/third_party/boost-1.60.0/boost/thread/detail/singleton.hpp
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+++ b/src/third_party/boost-1.60.0/boost/thread/detail/singleton.hpp
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+// Copyright (C) 2001-2003
+// Mac Murrett
+//
+// 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)
+//
+// See http://www.boost.org for most recent version including documentation.
+
+#ifndef BOOST_SINGLETON_MJM012402_HPP
+#define BOOST_SINGLETON_MJM012402_HPP
+
+#include <boost/thread/detail/config.hpp>
+
+namespace boost {
+namespace detail {
+namespace thread {
+
+// class singleton has the same goal as all singletons: create one instance of
+// a class on demand, then dish it out as requested.
+
+template <class T>
+class singleton : private T
+{
+private:
+    singleton();
+    ~singleton();
+
+public:
+    static T &instance();
+};
+
+
+template <class T>
+inline singleton<T>::singleton()
+{
+    /* no-op */
+}
+
+template <class T>
+inline singleton<T>::~singleton()
+{
+    /* no-op */
+}
+
+template <class T>
+/*static*/ T &singleton<T>::instance()
+{
+    // function-local static to force this to work correctly at static
+    // initialization time.
+    static singleton<T> s_oT;
+    return(s_oT);
+}
+
+} // namespace thread
+} // namespace detail
+} // namespace boost
+
+#endif // BOOST_SINGLETON_MJM012402_HPP