On 1 March 2015 at 12:44, Andrew Haley <aph@xxxxxxxxxx> wrote: > On 28/02/15 16:27, Manuel López-Ibáñez wrote: >> On the other hand, >> &cam_xyz[0][0] should have type 'double *', and the standard does say >> that the data is contiguously allocated, yet the c-faq says that >> ((double *)(&cam_xyz[0][0]))[j] "is not in strict conformance with the >> ANSI C Standard; according to an official interpretation" >> (http://c-faq.com/aryptr/ary2dfunc2.html), although without a >> reference to the standard, I have no idea what that means. [...] > Therefore the result of the inner > > *(cam_xyz+i) > > is a one-dimensional array. You have no permission to dereference > beyond the end of that array, and any attempt to do so is UB. Actually, the question that I was unsure about and I could not find a ready answer in the standard is whether one can use ((double *)(&cam_xyz[0][0]))[j] to address the whole multidimensional array. The C-FAQ seems to suggest that one cannot, but it is not crystal clear in this respect. Cheers, Manuel.
