I do not think that you can find any examples of this. The underlying mechanism only makes sense when mixing structure elements which have different sizes.
Still, if you can find any examples, it would be great to hear about them. Thanks, -- Raul On Thu, Jun 20, 2013 at 4:59 PM, <[email protected]> wrote: > GREG> 2)Is there a formula for header size depending on rank? > RAUL> So, expressed in C, it's (7+rank)*sizeof I > > There may also be some padding after the s[] shape elements and > before the data values following the header in order to have the > data values properly aligned. (Think of "doubles" requiring 8-byte > alignment, and having such padding always for uniformity reasons.) > This is platform-dependent. > > So, while Raul's > > (7+rank)*sizeof I > > indeed covers all relevant header elements, the offset for the first > data atom might or might not require some rounding up. > > As all the London Tubers know: "Mind the gap!" > > Martin > > PS (aka Padding Space): > > This padding space was occasionally an issue back when I made the > J Unix ports. Just very seldom, a test in the test suite would > fail because two arrays wouldn't match (-:) anymore -- when that > padding area wasn't properly initialized. Difficult to reproduce > and debug, back then. > > This is also what I *DON'T* like about the use 15!:0 for base > functionalities such as regexes or mmapped files: it pushes APIs > which are portable at the C source level into the J level where the > code working across many platforms gets very, very messy. > (Good luck, Greg!) > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
