Add boost_tuple_iterator_identity to compare iterator correctly.

And add test for boost_tuple_iterator.

include/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp

@@ -42,12 +42,18 @@ namespace boost { namespace fusion
         struct boost_tuple_is_empty<tuples::tuple<> const> : mpl::true_ {};
     }
 
+    template <typename Cons>
+    struct boost_tuple_iterator_identity;
+
     template <typename Cons = tuples::null_type>
     struct boost_tuple_iterator
         : iterator_facade<boost_tuple_iterator<Cons>, forward_traversal_tag>
     {
         typedef Cons cons_type;
 
+        typedef boost_tuple_iterator_identity<
+            typename add_const<Cons>::type> identity;
+
         BOOST_FUSION_GPU_ENABLED
         explicit boost_tuple_iterator(Cons& in_cons)
             : cons(in_cons) {}
@@ -133,6 +139,11 @@ namespace boost { namespace fusion
             }
         };
 
+        template <typename I1, typename I2>
+        struct equal_to
+            : is_same<typename I1::identity, typename I2::identity>
+        {};
+
     private:
         // silence MSVC warning C4512: assignment operator could not be generated
         boost_tuple_iterator& operator= (boost_tuple_iterator const&);
@@ -144,6 +155,9 @@ namespace boost { namespace fusion
     {
         typedef Null cons_type;
 
+        typedef boost_tuple_iterator_identity<
+            typename add_const<Null>::type> identity;
+
         template <typename I1, typename I2>
         struct equal_to
             : mpl::or_<

test/Jamfile

@@ -60,6 +60,7 @@ project
     [ run sequence/as_set.cpp :  :  :  : ]
     [ run sequence/as_vector.cpp :  :  :  : ]
     [ run sequence/boost_tuple.cpp :  :  :  : ]
+    [ run sequence/boost_tuple_iterator.cpp :  :  :  : ]
     [ run sequence/cons.cpp :  :  :  : ]
     [ run sequence/filter_view.cpp :  :  :  : ]
     [ run sequence/hash.cpp :  :  :  : ]

test/sequence/boost_tuple_iterator.cpp

@@ -0,0 +1,21 @@
+/*=============================================================================
+    Copyright (c) 2014 Kohei Takahashi
+
+    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)
+==============================================================================*/
+
+#include <boost/fusion/adapted/boost_tuple.hpp>
+
+#define FUSION_SEQUENCE boost::tuple
+#define FUSION_TRAVERSAL_TAG forward_traversal_tag
+#define FUSION_NO_PRIOR
+#include "./iterator.hpp"
+
+int
+main()
+{
+    test();
+    return boost::report_errors();
+}
+