On Fri, 23 Jul 2021 at 17:35, Patrick Palka via Libstdc++
<libstd...@gcc.gnu.org> wrote:
>
> In r12-569 I accidentally applied the LWG 3533 change that
> was intended for elements_view::iterator::base to
> elements_view::base instead.
>
> This patch corrects this, and also applies the corresponding LWG 3533
> change to lazy_split_view::inner-iter::base now that we implement P2210.
>
> Tested on x86_64-pc-linux-gnu, does this look OK for trunk and release
> branches?
OK, thanks.
>
> PR libstdc++/101589
>
> libstdc++-v3/ChangeLog:
>
> * include/std/ranges (lazy_split_view::_InnerIter::base): Make
> the const& overload unconstrained and return a const reference
> as per LWG 3533. Make unconditionally noexcept.
> (elements_view::base): Revert accidental r12-569 change.
> (elements_view::_Iterator::base): Make the const& overload
> unconstrained and return a const reference as per LWG 3533.
> Make unconditionally noexcept.
> ---
> libstdc++-v3/include/std/ranges | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
> index d791e15d096..50b414e8c8c 100644
> --- a/libstdc++-v3/include/std/ranges
> +++ b/libstdc++-v3/include/std/ranges
> @@ -3103,8 +3103,8 @@ namespace views::__adaptor
> : _M_i(std::move(__i))
> { }
>
> - constexpr iterator_t<_Base>
> - base() const& requires copyable<iterator_t<_Base>>
> + constexpr const iterator_t<_Base>&
> + base() const& noexcept
> { return _M_i_current(); }
>
> constexpr iterator_t<_Base>
> @@ -3786,8 +3786,8 @@ namespace views::__adaptor
> : _M_base(std::move(base))
> { }
>
> - constexpr const _Vp&
> - base() const & noexcept
> + constexpr _Vp
> + base() const& requires copy_constructible<_Vp>
> { return _M_base; }
>
> constexpr _Vp
> @@ -3913,9 +3913,8 @@ namespace views::__adaptor
> : _M_current(std::move(i._M_current))
> { }
>
> - constexpr iterator_t<_Base>
> - base() const&
> - requires copyable<iterator_t<_Base>>
> + constexpr const iterator_t<_Base>&
> + base() const& noexcept
> { return _M_current; }
>
> constexpr iterator_t<_Base>
> --
> 2.32.0.349.gdaab8a564f
>
