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diff --git a/src/third_party/boost-1.60.0/boost/smart_ptr/owner_less.hpp b/src/third_party/boost-1.60.0/boost/smart_ptr/owner_less.hpp
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+++ b/src/third_party/boost-1.60.0/boost/smart_ptr/owner_less.hpp
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+#ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+#define BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+
+//
+//  owner_less.hpp
+//
+//  Copyright (c) 2008 Frank Mori Hess
+//
+//  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/libs/smart_ptr/smart_ptr.htm for documentation.
+//
+
+#include <functional>
+
+namespace boost
+{
+  template<typename T> class shared_ptr;
+  template<typename T> class weak_ptr;
+
+  namespace detail
+  {
+    template<typename T, typename U>
+      struct generic_owner_less : public std::binary_function<T, T, bool>
+    {
+      bool operator()(const T &lhs, const T &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+      bool operator()(const T &lhs, const U &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+      bool operator()(const U &lhs, const T &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+    };
+  } // namespace detail
+
+  template<typename T> struct owner_less;
+
+  template<typename T>
+    struct owner_less<shared_ptr<T> >:
+    public detail::generic_owner_less<shared_ptr<T>, weak_ptr<T> >
+  {};
+
+  template<typename T>
+    struct owner_less<weak_ptr<T> >:
+    public detail::generic_owner_less<weak_ptr<T>, shared_ptr<T> >
+  {};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED