FYI, i'm preparing patches to this effect.
On Sat, Feb 15, 2014 at 11:13 PM, Richard Smith <[email protected]>wrote: > This seems to be going in the wrong direction. > > * max_align_t needs to be in <stddef.h> as well as in <cstddef> > * <stddef.h> is provided by the compiler, not by the standard library > * max_align_t is de facto part of the platform's ABI. It's not enough to > get the alignment right, you also need to get the size and mangled name of > the type right (and possibly other things too). > > IMO, the right thing to do here is to add a definition to max_align_t to > Clang's lib/Headers/stddef.h, and add a using declaration to libc++'s > cstddef to pull it into namespace std. > > > On Mon, Feb 10, 2014 at 1:16 PM, Howard Hinnant > <[email protected]>wrote: > >> On Feb 10, 2014, at 2:25 PM, Howard Hinnant <[email protected]> >> wrote: >> >> >> It seems like the old behavior follows the standard more closely. If >> Len >> >> == 17, then _any_ c++ object with size no greater than Len includes >> >> objects of size 16 and some objects of size 16 maybe have an alignment >> >> requirement of 16. >> > >> > Ok, I'm convinced, thanks. >> >> I've enclosed a slightly updated patch. I've added float as Kal >> suggested, but haven't added uintmax_t because of not wanting to couple >> <cstddef> to <cstddint>. I have not modified the behavior, thanks to Kal. >> >> std::__find_max_align<std::__all_types, 1>::value = 1 >> std::__find_max_align<std::__all_types, 2>::value = 2 >> std::__find_max_align<std::__all_types, 3>::value = 2 >> std::__find_max_align<std::__all_types, 4>::value = 4 >> std::__find_max_align<std::__all_types, 5>::value = 4 >> std::__find_max_align<std::__all_types, 6>::value = 4 >> std::__find_max_align<std::__all_types, 7>::value = 4 >> std::__find_max_align<std::__all_types, 8>::value = 8 >> std::__find_max_align<std::__all_types, 9>::value = 8 >> std::__find_max_align<std::__all_types, 10>::value = 8 >> std::__find_max_align<std::__all_types, 11>::value = 8 >> std::__find_max_align<std::__all_types, 12>::value = 8 >> std::__find_max_align<std::__all_types, 13>::value = 8 >> std::__find_max_align<std::__all_types, 14>::value = 8 >> std::__find_max_align<std::__all_types, 15>::value = 8 >> std::__find_max_align<std::__all_types, 16>::value = 16 >> std::__find_max_align<std::__all_types, 17>::value = 16 >> std::__find_max_align<std::__all_types, 18>::value = 16 >> std::__find_max_align<std::__all_types, 19>::value = 16 >> std::__find_max_align<std::__all_types, 20>::value = 16 >> std::__find_max_align<std::__all_types, 21>::value = 16 >> std::__find_max_align<std::__all_types, 22>::value = 16 >> std::__find_max_align<std::__all_types, 23>::value = 16 >> std::__find_max_align<std::__all_types, 24>::value = 16 >> std::__find_max_align<std::__all_types, 25>::value = 16 >> std::__find_max_align<std::__all_types, 26>::value = 16 >> std::__find_max_align<std::__all_types, 27>::value = 16 >> std::__find_max_align<std::__all_types, 28>::value = 16 >> std::__find_max_align<std::__all_types, 29>::value = 16 >> std::__find_max_align<std::__all_types, 30>::value = 16 >> std::__find_max_align<std::__all_types, 31>::value = 16 >> std::__find_max_align<std::__all_types, 32>::value = 16 >> std::__find_max_align<std::__all_types, 33>::value = 16 >> ... >> >> Howard >> >> _______________________________________________ >> cfe-commits mailing list >> [email protected] >> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits >> >> > > _______________________________________________ > cfe-commits mailing list > [email protected] > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits > >
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