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diff --git a/src/third_party/boost-1.60.0/boost/type_traits/add_const.hpp b/src/third_party/boost-1.60.0/boost/type_traits/add_const.hpp
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+++ b/src/third_party/boost-1.60.0/boost/type_traits/add_const.hpp
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+
+//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
+//  Hinnant & John Maddock 2000.
+//  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_ADD_CONST_HPP_INCLUDED
+#define BOOST_TT_ADD_CONST_HPP_INCLUDED
+
+#include <boost/type_traits/detail/config.hpp>
+
+namespace boost {
+
+// * convert a type T to const type - add_const<T>
+// this is not required since the result is always
+// the same as "T const", but it does suppress warnings
+// from some compilers:
+
+#if defined(BOOST_MSVC)
+// This bogus warning will appear when add_const is applied to a
+// const volatile reference because we can't detect const volatile
+// references with MSVC6.
+#   pragma warning(push)
+#   pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored
+#endif 
+
+   template <class T> struct add_const
+   {
+      typedef T const type;
+   };
+
+#if defined(BOOST_MSVC)
+#   pragma warning(pop)
+#endif 
+
+   template <class T> struct add_const<T&>
+   {
+      typedef T& type;
+   };
+
+} // namespace boost
+
+#endif // BOOST_TT_ADD_CONST_HPP_INCLUDED