fusion: merge of associative iterators/views and the new fold interface

[SVN r58618]

include/boost/fusion/adapted/std_pair/tag_of.hpp

@@ -15,6 +15,7 @@
 namespace boost { namespace fusion {
 
     struct std_pair_tag;
+    struct fusion_sequence_tag;
 
     namespace traits
     {
@@ -26,4 +27,22 @@ namespace boost { namespace fusion {
     }
 }}
 
+namespace boost { namespace mpl
+{
+    template<typename>
+    struct sequence_tag;
+
+    template<typename T1, typename T2>
+    struct sequence_tag<std::pair<T1, T2> >
+    {
+        typedef fusion::fusion_sequence_tag type;
+    };
+
+    template<typename T1, typename T2>
+    struct sequence_tag<std::pair<T1, T2> const>
+    {
+        typedef fusion::fusion_sequence_tag type;
+    };
+}}
+
 #endif