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From: Patrick Palka <ppalka@redhat.com>
To: gcc-patches@gcc.gnu.org
Cc: libstdc++@gcc.gnu.org, Patrick Palka <ppalka@redhat.com>
Subject: [PATCH] libstdc++: Implement LWG 3535 changes to ranges::join_view
Date: Wed, 20 Oct 2021 12:59:42 -0400	[thread overview]
Message-ID: <20211020165942.1827062-1-ppalka@redhat.com> (raw)

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


             reply	other threads:[~2021-10-20 16:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-20 16:59 Patrick Palka [this message]
2021-10-20 18:57 ` Jonathan Wakely

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