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diff --git a/boost_ext/boost/multi_index/detail/ord_index_args.hpp b/boost_ext/boost/multi_index/detail/ord_index_args.hpp
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+/* Copyright 2003-2005 Joaquín M López Muñoz.
+ * 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/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_ORD_INDEX_ARGS_HPP
+#define BOOST_MULTI_INDEX_DETAIL_ORD_INDEX_ARGS_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/aux_/na.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/multi_index/tag.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <functional>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Oredered index specifiers can be instantiated in two forms:
+ *
+ *   (ordered_unique|ordered_non_unique)<
+ *     KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
+ *   (ordered_unique|ordered_non_unique)<
+ *     TagList,KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
+ *
+ * index_args implements the machinery to accept this argument-dependent
+ * polymorphism.
+ */
+
+template<typename KeyFromValue>
+struct index_args_default_compare
+{
+  typedef std::less<typename KeyFromValue::result_type> type;
+};
+
+template<typename Arg1,typename Arg2,typename Arg3>
+struct ordered_index_args
+{
+  typedef is_tag<Arg1> full_form;
+
+  typedef typename mpl::if_<
+    full_form,
+    Arg1,
+    tag< > >::type                                   tag_list_type;
+  typedef typename mpl::if_<
+    full_form,
+    Arg2,
+    Arg1>::type                                      key_from_value_type;
+  typedef typename mpl::if_<
+    full_form,
+    Arg3,
+    Arg2>::type                                      supplied_compare_type;
+  typedef typename mpl::eval_if<
+    mpl::is_na<supplied_compare_type>,
+    index_args_default_compare<key_from_value_type>,
+    mpl::identity<supplied_compare_type>
+  >::type                                            compare_type;
+
+  BOOST_STATIC_ASSERT(is_tag<tag_list_type>::value);
+  BOOST_STATIC_ASSERT(!mpl::is_na<key_from_value_type>::value);
+  BOOST_STATIC_ASSERT(!mpl::is_na<compare_type>::value);
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif