In view of recent posts: http://article.gmane.org/gmane.comp.lib.boost.devel/119358 http://article.gmane.org/gmane.comp.lib.boost.devel/119684 suggesting an interest in fixed size matrices (I guess in order to speed execution) would it be desirable to have a variation of multi_array where ExtentList was one of the template arguments instead of an argument to the CTOR, as described here: http://www.boost.org/libs/multi_array/doc/reference.html#multi_array ? Of course the ExtentList would just contain compile time constants, something like mpl::vector_c<mpl::pair<index,index>,....> where: typedef multi_array_types::index index; and the args to pair<index,index> would correspond to the args to extent_range::extent_range(index start, index finish) where, of course, extent_range is the current multi_array class.