-----Original Message----- From: Perry E. Metzger [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 26, 2008 9:39 AM To: Lux, James P Cc: Michael H. Frese; Beowulf@beowulf.org Subject: Re: [Beowulf] Stroustrup regarding multicore
"Lux, James P" <[EMAIL PROTECTED]> writes: > The example you give is going to be compiler dependent. Even if it were, I defy you to find a c compiler that does differently. As it is, this is not in fact compiler dependent. > There's no requirement in K&R There is, but in any case, K&R is not the controlling document, the ANSI standard is. I have a copy of the C99 document and it is indeed required that the locations be consecutive (though there can of course be padding for alignment purposes if you have an array of structures). If you wish for me to quote chapter and verse from the document, I will. > All that is guaranteed is that you can retrieve the successive > elements of the array by successive values of the index. No. You are actually given guarantees about memory layout. They're not phrased as such, but they're quite rigid. (This is rather different from the situation with, for example, pointers, where you are explicitly not guaranteed that pointer types are interchangeable.) Perry Interesting... We have coding standards here (JPL) for flight software (derived from MISRA to a large part), which I will readily concede is NOT generally HPC computing, that assert that one cannot depend on a particular memory layout, unless it's explicitly defined somehow. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf