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diff --git a/src/third_party/boost-1.69.0/boost/type_traits/is_reference.hpp b/src/third_party/boost-1.69.0/boost/type_traits/is_reference.hpp
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+++ b/src/third_party/boost-1.69.0/boost/type_traits/is_reference.hpp
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+
+//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, 
+//      Howard Hinnant and John Maddock 2000, 2010. 
+//  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
+
+//  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
+
+#ifndef BOOST_TT_IS_REFERENCE_HPP_INCLUDED
+#define BOOST_TT_IS_REFERENCE_HPP_INCLUDED
+
+#include <boost/type_traits/is_lvalue_reference.hpp>
+#include <boost/type_traits/is_rvalue_reference.hpp>
+
+namespace boost {
+
+template <class T> struct is_reference 
+   : public 
+   integral_constant<
+      bool, 
+      ::boost::is_lvalue_reference<T>::value || ::boost::is_rvalue_reference<T>::value>
+{};
+
+} // namespace boost
+
+#endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED
+