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diff --git a/3rdParty/Boost/src/boost/spirit/home/classic/core/impl/match_attr_traits.ipp b/3rdParty/Boost/src/boost/spirit/home/classic/core/impl/match_attr_traits.ipp
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+++ b/3rdParty/Boost/src/boost/spirit/home/classic/core/impl/match_attr_traits.ipp
@@ -0,0 +1,102 @@
+/*=============================================================================
+    Copyright (c) 1998-2003 Joel de Guzman
+    http://spirit.sourceforge.net/
+
+    Use, modification and distribution is 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)
+=============================================================================*/
+#if !defined(BOOST_SPIRIT_MATCH_ATTR_TRAITS_IPP)
+#define BOOST_SPIRIT_MATCH_ATTR_TRAITS_IPP
+
+#include <boost/optional.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/or.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/is_same.hpp>
+
+namespace boost { namespace spirit { 
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+namespace impl
+{
+    template <typename T>
+    struct match_attr_traits
+    {
+        typedef typename
+            boost::optional<T>::reference_const_type
+        const_reference;
+
+        //  case where src *IS* convertible to T (dest)
+        template <typename T2>
+        static void
+        convert(boost::optional<T>& dest, T2 const& src, mpl::true_)
+        { 
+            dest.reset(src); 
+        }
+
+        //  case where src *IS NOT* convertible to T (dest)
+        template <typename T2>
+        static void
+        convert(boost::optional<T>& dest, T2 const& /*src*/, mpl::false_)
+        { 
+            dest.reset(); 
+        }
+
+        static void
+        convert(boost::optional<T>& dest, nil_t/*src*/)
+        { 
+            dest.reset(); 
+        }
+        
+        template <typename T2>
+        static void
+        convert(boost::optional<T>& dest, T2 const& src)
+        { 
+            convert(dest, src, is_convertible<T2, T>());
+        }
+
+        template <typename OtherMatchT>
+        static void
+        copy(boost::optional<T>& dest, OtherMatchT const& src)
+        {
+            if (src.has_valid_attribute())
+                convert(dest, src.value());
+        }
+
+        template <typename OtherMatchT>
+        static void
+        assign(boost::optional<T>& dest, OtherMatchT const& src)
+        {
+            if (src.has_valid_attribute())
+                convert(dest, src.value());
+            else
+                dest.reset();
+        }
+
+        // T is not reference
+        template <typename ValueT>
+        static void
+        set_value(boost::optional<T>& dest, ValueT const& val, mpl::false_)
+        {
+            dest.reset(val);
+        }
+
+        // T is a reference
+        template <typename ValueT>
+        static void
+        set_value(boost::optional<T>& dest, ValueT const& val, mpl::true_)
+        {
+            dest.get() = val;
+        }
+    };
+
+}
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}} // namespace boost::spirit::impl
+
+#endif
+