[Bug libstdc++/114477] New: The user-defined constructor of filter_view::iterator is not fully compliant with the standard

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114477

            Bug ID: 114477
           Summary: The user-defined constructor of filter_view::iterator
                    is not fully compliant with the standard
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Since P3059R0 is closed (although I feel bad about this), this suggests that
libstdc++ may need to modify the user-defined constructor of
filter_view::iterator:

  #include <ranges>
  auto base = std::views::iota(0);
  auto filter = base | std::views::filter([](int) { return true; });
  auto begin = decltype(filter.begin())(filter, base.begin()); // should ok

https://godbolt.org/z/T7nY68rej