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* [PATCH] libstdc++: Implement LWG 3535 changes to ranges::join_view
@ 2021-10-20 16:59 Patrick Palka
  2021-10-20 18:57 ` Jonathan Wakely
  0 siblings, 1 reply; 2+ messages in thread
From: Patrick Palka @ 2021-10-20 16:59 UTC (permalink / raw)
  To: gcc-patches; +Cc: libstdc++, Patrick Palka

Tested on x86_64-pc-linux-gnu, does this look OK for trunk, and branches
after a while?

libstdc++-v3/ChangeLog:

	* include/std/ranges (join_view::__iter_cat::_S_iter_cat): Adjust
	criteria for returning bidirectional_iterator_tag as per LWG3535.
	(join_view::_Iterator::_S_iter_concept): Likewise.
---
 libstdc++-v3/include/std/ranges | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index 273699aa790..c1519c7dbd5 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -2523,7 +2523,8 @@ namespace views::__adaptor
 	    using _OuterCat = typename iterator_traits<_Outer_iter>::iterator_category;
 	    using _InnerCat = typename iterator_traits<_Inner_iter>::iterator_category;
 	    if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag>
-			  && derived_from<_InnerCat, bidirectional_iterator_tag>)
+			  && derived_from<_InnerCat, bidirectional_iterator_tag>
+			  && common_range<range_reference_t<_Base<_Const>>>)
 	      return bidirectional_iterator_tag{};
 	    else if constexpr (derived_from<_OuterCat, forward_iterator_tag>
 			       && derived_from<_InnerCat, forward_iterator_tag>)
@@ -2575,7 +2576,8 @@ namespace views::__adaptor
 	  {
 	    if constexpr (_S_ref_is_glvalue
 			  && bidirectional_range<_Base>
-			  && bidirectional_range<range_reference_t<_Base>>)
+			  && bidirectional_range<range_reference_t<_Base>>
+			  && common_range<range_reference_t<_Base>>)
 	      return bidirectional_iterator_tag{};
 	    else if constexpr (_S_ref_is_glvalue
 			       && forward_range<_Base>
-- 
2.33.1.711.g9d530dc002


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] libstdc++: Implement LWG 3535 changes to ranges::join_view
  2021-10-20 16:59 [PATCH] libstdc++: Implement LWG 3535 changes to ranges::join_view Patrick Palka
@ 2021-10-20 18:57 ` Jonathan Wakely
  0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2021-10-20 18:57 UTC (permalink / raw)
  To: Patrick Palka; +Cc: gcc Patches, libstdc++

On Wed, 20 Oct 2021 at 18:03, Patrick Palka via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Tested on x86_64-pc-linux-gnu, does this look OK for trunk, and branches
> after a while?

Yes for all.


>
> libstdc++-v3/ChangeLog:
>
>         * include/std/ranges (join_view::__iter_cat::_S_iter_cat): Adjust
>         criteria for returning bidirectional_iterator_tag as per LWG3535.
>         (join_view::_Iterator::_S_iter_concept): Likewise.
> ---
>  libstdc++-v3/include/std/ranges | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
> index 273699aa790..c1519c7dbd5 100644
> --- a/libstdc++-v3/include/std/ranges
> +++ b/libstdc++-v3/include/std/ranges
> @@ -2523,7 +2523,8 @@ namespace views::__adaptor
>             using _OuterCat = typename iterator_traits<_Outer_iter>::iterator_category;
>             using _InnerCat = typename iterator_traits<_Inner_iter>::iterator_category;
>             if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag>
> -                         && derived_from<_InnerCat, bidirectional_iterator_tag>)
> +                         && derived_from<_InnerCat, bidirectional_iterator_tag>
> +                         && common_range<range_reference_t<_Base<_Const>>>)
>               return bidirectional_iterator_tag{};
>             else if constexpr (derived_from<_OuterCat, forward_iterator_tag>
>                                && derived_from<_InnerCat, forward_iterator_tag>)
> @@ -2575,7 +2576,8 @@ namespace views::__adaptor
>           {
>             if constexpr (_S_ref_is_glvalue
>                           && bidirectional_range<_Base>
> -                         && bidirectional_range<range_reference_t<_Base>>)
> +                         && bidirectional_range<range_reference_t<_Base>>
> +                         && common_range<range_reference_t<_Base>>)
>               return bidirectional_iterator_tag{};
>             else if constexpr (_S_ref_is_glvalue
>                                && forward_range<_Base>
> --
> 2.33.1.711.g9d530dc002
>


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