[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #11 from Jonathan Wakely --- Fixed for 10.4 and 11.4 too.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #10 from CVS Commits --- The releases/gcc-10 branch has been updated by Jonathan Wakely : https://gcc.gnu.org/g:ba2baf20356befbba6c8d83bbb3676cfee7e146f commit r10-10574-gba2baf20356befbba6c8d83bbb3676cfee7e146f Author: Jonathan Wakely Date: Mon Nov 1 11:32:39 2021 + libstdc++: Reorder constraints on std::span::span(Range&&) constructor. In PR libstdc++/103013 Tim Song pointed out that we could reorder the constraints of this constructor. That's worth doing just to reduce the work the compiler has to do during overload resolution, even if it isn't needed to make the code in the PR work. libstdc++-v3/ChangeLog: * include/std/span (span(Range&&)): Reorder constraints. (cherry picked from commit 09bc98098e4ad474d2ba9da52457b29bbd08874b)
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #9 from CVS Commits --- The releases/gcc-11 branch has been updated by Jonathan Wakely : https://gcc.gnu.org/g:2b0ddcec0e4cc46852e0a4dd7d00307d46233ec0 commit r11-9911-g2b0ddcec0e4cc46852e0a4dd7d00307d46233ec0 Author: Jonathan Wakely Date: Mon Nov 1 11:32:39 2021 + libstdc++: Reorder constraints on std::span::span(Range&&) constructor. In PR libstdc++/103013 Tim Song pointed out that we could reorder the constraints of this constructor. That's worth doing just to reduce the work the compiler has to do during overload resolution, even if it isn't needed to make the code in the PR work. libstdc++-v3/ChangeLog: * include/std/span (span(Range&&)): Reorder constraints. (cherry picked from commit 09bc98098e4ad474d2ba9da52457b29bbd08874b)
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 Jonathan Wakely changed: What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |FIXED --- Comment #8 from Jonathan Wakely --- Done.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #7 from CVS Commits --- The master branch has been updated by Jonathan Wakely : https://gcc.gnu.org/g:09bc98098e4ad474d2ba9da52457b29bbd08874b commit r12-4833-g09bc98098e4ad474d2ba9da52457b29bbd08874b Author: Jonathan Wakely Date: Mon Nov 1 11:32:39 2021 + libstdc++: Reorder constraints on std::span::span(Range&&) constructor. In PR libstdc++/103013 Tim Song pointed out that we could reorder the constraints of this constructor. That's worth doing just to reduce the work the compiler has to do during overload resolution, even if it isn't needed to make the code in the PR work. libstdc++-v3/ChangeLog: * include/std/span (span(Range&&)): Reorder constraints.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 Jonathan Wakely changed: What|Removed |Added Last reconfirmed||2021-11-01 Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org Ever confirmed|0 |1 Status|UNCONFIRMED |ASSIGNED --- Comment #6 from Jonathan Wakely --- (In reply to TC from comment #4) > I don't think this needs an extra constraint, just reordering the existing > ones to check not-a-span (14.3, "remove_cvref_t is not a specialization > of span") first. Good point - we should do that just because it's cheaper to evaluate the !is_span check before we waste time determining if it's a contiguous range.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #5 from Andrey --- Sorry, my fault, spanhttps://eel.is/c++draft/views.span#span.overview-4. It looks strange for me, but of course, it's not a topic for this tracker.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 TC changed: What|Removed |Added CC||rs2740 at gmail dot com --- Comment #4 from TC --- I don't think this needs an extra constraint, just reordering the existing ones to check not-a-span (14.3, "remove_cvref_t is not a specialization of span") first. But this is very much undefined anyway.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #3 from Jonathan Wakely --- And libstdc++ has exactly the constraints required by the C++ draft. I suggest reporting this as an LWG defect.
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #2 from Jonathan Wakely --- According to the standard, span is undefined behaviour, see the last bullet of [res.on.functions].
[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013 --- Comment #1 from Andrey --- Sorry, the first link to godbolt in the starter message is wrong, it should be https://gcc.godbolt.org/z/jWeqs6cM4.
