One can use e.g. section() to provide read-only "peephole" subsets of containers into map(), but there doesn't seem to be a read-write equivalent for map() results except to createa temporary container and then replace() the results.I've tried this and ArBBdoes not seem aware enough to eliminate the temporary data copies. The performance loss depends on the fractionof data being processed.
Also the othermap() inputsmust have the same dimensionality and size, which iskind of a waste.
A trivial example would be red-eye reductionfor photos; there's no need for map() to know about the whole photo just to update a tiny portion.
Does anyone else foresee a need like this?