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 Subject: Re: [hwloc-devel] What does this C99 notation mean? From: Samuel Thibault (samuel.thibault_at_[hidden]) Date: 2011-02-11 22:51:18 Next message: Samuel Thibault: "Re: [hwloc-devel] get cpu where a process/thread is executing" Previous message: Jeff Squyres: "[hwloc-devel] What does this C99 notation mean?" Maybe in reply to: Jeff Squyres: "[hwloc-devel] What does this C99 notation mean?" Next in thread: Jeff Squyres: "Re: [hwloc-devel] What does this C99 notation mean?" Reply: Jeff Squyres: "Re: [hwloc-devel] What does this C99 notation mean?" Jeff Squyres, le Sat 12 Feb 2011 04:34:36 +0100, a écrit : > static void > hwloc_setup_groups_from_distances(struct hwloc_topology *topology, > unsigned nbobjs, > struct hwloc_obj **objs, > float *_distances) > { > 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. That's exactly it. It permits to keep code less clumsly to read. Samuel Next message: Samuel Thibault: "Re: [hwloc-devel] get cpu where a process/thread is executing" Previous message: Jeff Squyres: "[hwloc-devel] What does this C99 notation mean?" Maybe in reply to: Jeff Squyres: "[hwloc-devel] What does this C99 notation mean?" Next in thread: Jeff Squyres: "Re: [hwloc-devel] What does this C99 notation mean?" Reply: Jeff Squyres: "Re: [hwloc-devel] What does this C99 notation mean?"