On Tue, 26 Aug 2008 12:53:11 -0400 "Perry E. Metzger" wrote: > "Perry E. Metzger" <[EMAIL PROTECTED]> writes: > > 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. > > For the hell of it, I whipped my copy out, since I was in the mood. > > Indeed, if one looks at page 47 of Technical Corrigendum 2 of the C99 > document, one learns that: > > An array type describes a contiguously allocated nonempty set of > objects with a particular member object type, called the element > type. > > Note the phrase "contiguously allocated", which is a term of art in > the document meaning precisely what you think it means.
Hi Perry, Thank you for shining some light into this language ghetto !!! [ And I mean that in the best possible sense. Its sad to see some folks on this list make such simultaneously eager and untrue pronouncements about programming languages. ] The ISO C++ standard has similar contiguous-allocation guarantees such as (Sec 23.2.4 of ISO/IEC 14882:2003): A vector is a kind of sequence that supports random access iterators. In addition, it supports (amortized) constant time insert and erase operations at the end; insert and erase in the middle take linear time. Storage management is handled automatically, though hints can be given to improve efficiency. The elements of a vector are stored contiguously, meaning that if v is a vector<T, Allocator> where T is some type other than bool, then it obeys the identity &v[n] == &v[0] + n for all 0 <= n < v.size(). And guarantees like the above make it rather easy for programmers to, for instance, "assemble" their inputs in C++ and then, if they want, call C, Fortran, assembly-optimized, or even GPU-/FPGA-implemented routines to perform BLAS, (I)DFT, or other operations. Remember, folks, languages do not have to be an "xor" choice. The "and" operator is available to all of us. Ed -- Edward H. Hill III, PhD | [EMAIL PROTECTED] | http://eh3.com/
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