Removed iterator generators from iterator.hpp

Now using mpl::if_c to pick a value_accessor class.


[SVN r19697]

libs/multi_array

@@ -1 +1 @@
-Subproject commit ea278bfd8834b5bb85cd817443b39ddb7159269a
+Subproject commit b27fbb3a787e0bd6f591d74396906c9f7fea4721