GCC modified for the FreeChainXenon project
0e64bbb882
Currently __maybe_present_t<false, T> maps to the same empty class type independent of T. This is suboptimal because it means adjacent __maybe_present_t<false, ...> members with the [[no_unique_address]] attribute can't overlap even if the conditionally present types are different. This patch turns this empty class type into a template parameterized by the conditionally present type, so that [[no_unique_address]] __maybe_present_t<false, T> _M_a; [[no_unique_address]] __maybe_present_t<false, U> _M_b; now overlap if T and U are different. This patch goes a step further and also adds an optional integer discriminator parameter to allow for overlapping when T and U are the same. libstdc++-v3/ChangeLog: * include/std/ranges (ranges::__detail::_Empty): Rename to ... (ranges::__detail::_Absent): ... this. Turn into a template parameterized by the absent type _Tp and discriminator _Disc. (ranges::__detail::__maybe_present_t): Add an optional discriminator parameter. (slide_view::_M_cached_begin): Pass a discriminator argument to __maybe_present_t. (slide_view::_M_cached_end): Likewise. * testsuite/std/ranges/adaptors/sizeof.cc: Verify the size of slide_view<V> is 3 instead 4 pointers. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> |
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