From 9b7b9db979b80cbc8e62c52c35be40ca8fc7d0b1 Mon Sep 17 00:00:00 2001
From: Steven Watanabe <steven@providere-consulting.com>
Date: Sun, 13 Jun 2010 01:22:41 +0000
Subject: [PATCH] Translate fusion iterator categories to MPL iteraotr
 categories for fusion_iterator.  Fixes #3204.

[SVN r62889]
---
 .../fusion/iterator/mpl/fusion_iterator.hpp   | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/boost/fusion/iterator/mpl/fusion_iterator.hpp b/include/boost/fusion/iterator/mpl/fusion_iterator.hpp
index 150db549..b18ef8f0 100644
--- a/include/boost/fusion/iterator/mpl/fusion_iterator.hpp
+++ b/include/boost/fusion/iterator/mpl/fusion_iterator.hpp
@@ -16,6 +16,27 @@
 #include <boost/mpl/next_prior.hpp>
 #include <boost/mpl/advance_fwd.hpp>
 #include <boost/mpl/distance_fwd.hpp>
+#include <boost/mpl/iterator_tags.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+
+template<class Category>
+struct to_mpl_category {
+    typedef typename mpl::eval_if<
+        is_base_of<random_access_traversal_tag, Category>,
+        mpl::random_access_iterator_tag,
+        mpl::eval_if<
+            is_base_of<bidirectional_traversal_tag, Category>,
+            mpl::bidirectional_iterator_tag,
+            mpl::forward_iterator_tag
+        >
+    >::type type;
+};
+
+}}}
 
 namespace boost { namespace mpl
 {
@@ -23,7 +44,8 @@ namespace boost { namespace mpl
     struct fusion_iterator
     {
         typedef typename fusion::result_of::value_of<Iterator>::type type;
-        typedef typename fusion::traits::category_of<Iterator>::type category;
+        typedef typename fusion::traits::category_of<Iterator>::type fusion_category;
+        typedef typename fusion::detail::to_mpl_category<fusion_category>::type category;
         typedef Iterator iterator;
     };