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diff --git a/src/third_party/boost-1.60.0/boost/iterator/minimum_category.hpp b/src/third_party/boost-1.60.0/boost/iterator/minimum_category.hpp
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+++ b/src/third_party/boost-1.60.0/boost/iterator/minimum_category.hpp
@@ -0,0 +1,95 @@
+// Copyright David Abrahams 2003. 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)
+#ifndef BOOST_ITERATOR_MINIMUM_CATEGORY_HPP_INCLUDED_
+# define BOOST_ITERATOR_MINIMUM_CATEGORY_HPP_INCLUDED_
+
+# include <boost/static_assert.hpp>
+# include <boost/type_traits/is_convertible.hpp>
+# include <boost/type_traits/is_same.hpp>
+
+# include <boost/mpl/placeholders.hpp>
+# include <boost/mpl/aux_/lambda_support.hpp>
+
+namespace boost {
+namespace iterators {
+namespace detail {
+
+template <bool GreaterEqual, bool LessEqual>
+struct minimum_category_impl;
+
+template <class T1, class T2>
+struct error_not_related_by_convertibility;
+
+template <>
+struct minimum_category_impl<true,false>
+{
+    template <class T1, class T2> struct apply
+    {
+        typedef T2 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<false,true>
+{
+    template <class T1, class T2> struct apply
+    {
+        typedef T1 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<true,true>
+{
+    template <class T1, class T2> struct apply
+    {
+        BOOST_STATIC_ASSERT((is_same<T1,T2>::value));
+        typedef T1 type;
+    };
+};
+
+template <>
+struct minimum_category_impl<false,false>
+{
+    template <class T1, class T2> struct apply
+      : error_not_related_by_convertibility<T1,T2>
+    {
+    };
+};
+
+} // namespace detail
+
+//
+// Returns the minimum category type or fails to compile
+// if T1 and T2 are unrelated.
+//
+template <class T1 = mpl::_1, class T2 = mpl::_2>
+struct minimum_category
+{
+    typedef boost::iterators::detail::minimum_category_impl<
+        ::boost::is_convertible<T1,T2>::value
+      , ::boost::is_convertible<T2,T1>::value
+    > outer;
+
+    typedef typename outer::template apply<T1,T2> inner;
+    typedef typename inner::type type;
+
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2,minimum_category,(T1,T2))
+};
+
+template <>
+struct minimum_category<mpl::_1,mpl::_2>
+{
+    template <class T1, class T2>
+    struct apply : minimum_category<T1,T2>
+    {};
+
+    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2,minimum_category,(mpl::_1,mpl::_2))
+};
+
+} // namespace iterators
+
+} // namespace boost
+
+#endif // BOOST_ITERATOR_MINIMUM_CATEGORY_HPP_INCLUDED_