In distances.c, I see:
hwloc_setup_groups_from_distances(struct hwloc_topology *topology,
struct hwloc_obj **objs,
float (*distances)[nbobjs][nbobjs] = (float (*)[nbobjs][nbobjs])_distances;
As far as I can tell, _distances is a 1D array of floats, but it is of size (nbobjs*nbobjs) -- i.e., you could think of it as a 2D array, and index the i'th column in the j'th row at _distances[i * nbobjs + j]. From how its used in the code, distances is treated as a 2D array -- i.e., distances[i][j] is accessed.
I have a bunch of guesses as to what this means, but none of them seem quite right, so I figured I just ask -- what the heck does that declaration statement mean?
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