Add make_tagged_iterator

thrust/iterator/detail/tagged_iterator.h

@@ -58,6 +58,21 @@ template<typename Iterator, typename Tag>
       : super_t(x) {}
 }; // end tagged_iterator
 
+/*! \p make_tagged_iterator creates a \p tagged_iterator
+ *  from a \c Iterator with system tag \c Tag.
+ *
+ *  \tparam Tag Any system tag.
+ *  \tparam Iterator Any iterator type.
+ *  \param iter The iterator of interest.
+ *  \return An iterator whose system tag is \p Tag and whose behavior is otherwise
+ *          equivalent to \p iter.
+ */
+template <typename Tag, typename Iterator>
+inline auto make_tagged_iterator(Iterator iter)
+{
+  return tagged_iterator<Iterator, Tag>(iter);
+}
+
 } // end detail
 
 // tagged_iterator is trivial if its base iterator is.