[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 Richard Biener changed: What|Removed |Added Target Milestone|10.5|11.3 Known to fail||10.5.0 Resolution|--- |FIXED Status|ASSIGNED|RESOLVED Known to work||11.3.0 --- Comment #26 from Richard Biener --- Fixed in 11.3.
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 Jakub Jelinek changed: What|Removed |Added Target Milestone|10.4|10.5 --- Comment #25 from Jakub Jelinek --- GCC 10.4 is being released, retargeting bugs to GCC 10.5.
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 --- Comment #24 from Zach Laine --- Sorry for the delay. I confirmed that this makes my case well-formed with releases/gcc-11, and that it's ill-formed with GCC 11.2 and GCC 10.x.
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 Jonathan Wakely changed: What|Removed |Added Target Milestone|10.3|10.4 Known to work||12.0 Status|SUSPENDED |ASSIGNED Known to fail||10.3.0, 11.2.0 --- Comment #23 from Jonathan Wakely --- Fixed for 11.3 now. If any of you who hit this bug could test GCC trunk or the gcc-11 branch and confirm it works for your cases now, that would be much appreciated (there are no actual testcases here in this bug).
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 --- Comment #22 from CVS Commits --- The releases/gcc-11 branch has been updated by Jonathan Wakely : https://gcc.gnu.org/g:8d3391d64799d490117ad48432a9ad2cf38b0091 commit r11-9317-g8d3391d64799d490117ad48432a9ad2cf38b0091 Author: Jonathan Wakely Date: Thu Nov 25 23:29:08 2021 + libstdc++: Make std::pointer_traits SFINAE-friendly [PR96416] This is a simplified version of r12-5532 for the release branches. It still removes the problematic static_assert, but rather than making std::pointer_traits completely empty when the element_type can't be deduced, it just disables element_type and pointer_to. Additionally, the pointer_to member is not completely absent when element_type is cv void, it just has an unusable signature. This is sufficient to avoid errors outside the immediate context when trying to use std::to_address. libstdc++-v3/ChangeLog: PR libstdc++/96416 * include/bits/ptr_traits.h (pointer_traits): Remove static_assert checking for valid element_type. (pointer_traits::element_type, pointer_traits::pointer_to): Do not define when element type cannot be deduced. * testsuite/20_util/pointer_traits/lwg3545.cc: New test. * testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line. * testsuite/20_util/to_address/lwg3545.cc: New test. (cherry picked from commit b8018e5c5ec0e9b6948182f13fba47c67b758d8a)
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 --- Comment #21 from CVS Commits --- The master branch has been updated by Jonathan Wakely : https://gcc.gnu.org/g:b8018e5c5ec0e9b6948182f13fba47c67b758d8a commit r12-5532-gb8018e5c5ec0e9b6948182f13fba47c67b758d8a Author: Jonathan Wakely Date: Thu Nov 25 16:49:45 2021 + libstdc++: Make std::pointer_traits SFINAE-friendly [PR96416] This implements the resolution I'm proposing for LWG 3545, to avoid hard errors when using std::to_address for types that make pointer_traits ill-formed. Consistent with std::iterator_traits, instantiating std::pointer_traits for a non-pointer type will be well-formed, but give an empty type with no member types. This avoids the problematic cases for std::to_address. Additionally, the pointer_to member is now only declared when the element type is not cv void (and for C++20, when the function body would be well-formed). The rebind member was already SFINAE-friendly in our implementation. libstdc++-v3/ChangeLog: PR libstdc++/96416 * include/bits/ptr_traits.h (pointer_traits): Reimplement to be SFINAE-friendly (LWG 3545). * testsuite/20_util/pointer_traits/lwg3545.cc: New test. * testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line. * testsuite/20_util/to_address/lwg3545.cc: New test.
[Bug libstdc++/96416] [DR 3545] to_address() is broken by static_assert in pointer_traits
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96416 Jonathan Wakely changed: What|Removed |Added Status|RESOLVED|SUSPENDED Summary|to_address() is broken by |[DR 3545] to_address() is |static_assert in|broken by static_assert in |pointer_traits |pointer_traits Resolution|INVALID |--- --- Comment #20 from Jonathan Wakely --- Reopening and suspending, until https://wg21.link/lwg3545 is resolved.
