On 4/25/06, Greg Link < link@cse.psu.edu> wrote:

I'm using multi_array types as containers for some things I'm working
on, and the number of dimensions can get quite large - often over 7,
sometimes as high as 11. I'd like to do things such as initialize
these multi_arrays, access all elements within them, and other such
'reasonable' operations.

Thing is, the only iterator interface to multi_array returns a
reference to the nested containers. Thus, to iterate over all sub-
elements, I'm forced to have 7-11 nested for-loops to iterate over
the entire thing.

Is there an existent means of simply iterating over the entire set of
data in the multi_array? Has anyone implemented such a thing, or is
such a thing something to be desired within boost::multi_array? It
seems like such a iterator would be especially useful if also
implemented/supported within subgroups, allowing the user to define
sub-ranges of the multi_array, then iterate over each element
therein, without having to worry about dimensionality, et cetera.

Any thoughts, ideas, or pointers to how to easily (without tons of
code) iterate over an 11-dimensioned object is appreciated.

In conclusion then, I've got two problems. One is "How can I simplify
my each-element access to a high-dimensional multi_array", and the
second is "Should there be a direct-to-element iterator in
multi_array, and does the documentation adequately address the issue
of whether or not an iterator points to elements directly or to a sub-
graph?"

Thanks for your time and troubles,

- Greg Link

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