[{"id":3678804,"web_url":"http://patchwork.ozlabs.org/comment/3678804/","msgid":"","list_archive_url":null,"date":"2026-04-17T15:43:08","subject":"Re: [PATCH] libstdc++: Fix constraint recursion in std:indirect's\n operator== [PR124890]","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On Fri, 17 Apr 2026 at 16:40, Patrick Palka wrote:\n>\n> Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n\nOK, thanks.\n\n>\n> We can also just implement the Mandates as a static_assert as pointed\n> out by Lénárd. Otherwise, I prefer this approach rather than the\n> forwarding reference approach since it's cleaner and we use this approach\n> in other parts of the library with no complaints so far.\n>\n> -- >8 --\n>\n> Like in r16-559 for std::expected, std::indirect's operator== is also\n> prone to constraint recursion due to CWG 2369. This patch works around\n> the recursion in a similar manner.\n>\n> PR libstdc++/124890\n> PR libstdc++/119714\n> PR libstdc++/112490\n>\n> libstdc++-v3/ChangeLog:\n>\n> * include/bits/indirect.h (indirect::operator==): Replace\n> non-dependent std::indirect function parameter with a\n> dependent one of type indirect<_Tp2> where _Tp2 matches _Tp.\n> * testsuite/std/memory/indirect/124890.cc: New test.\n> ---\n> libstdc++-v3/include/bits/indirect.h | 4 ++--\n> libstdc++-v3/testsuite/std/memory/indirect/124890.cc | 9 +++++++++\n> 2 files changed, 11 insertions(+), 2 deletions(-)\n> create mode 100644 libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n>\n> diff --git a/libstdc++-v3/include/bits/indirect.h b/libstdc++-v3/include/bits/indirect.h\n> index 2df46cc39a21..e1f7d1968b56 100644\n> --- a/libstdc++-v3/include/bits/indirect.h\n> +++ b/libstdc++-v3/include/bits/indirect.h\n> @@ -344,11 +344,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n> return __lhs.__get() == __rhs.__get();\n> }\n>\n> - template\n> + template _Tp2, typename _Up>\n> requires (!__is_indirect<_Up>) // See PR c++/99599\n> && requires (const _Tp& __t, const _Up& __u) { __t == __u; }\n> friend constexpr bool\n> - operator==(const indirect& __lhs, const _Up& __rhs)\n> + operator==(const indirect<_Tp2>& __lhs, const _Up& __rhs)\n> noexcept(noexcept(*__lhs == __rhs))\n> {\n> if (!__lhs._M_objp)\n> diff --git a/libstdc++-v3/testsuite/std/memory/indirect/124890.cc b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n> new file mode 100644\n> index 000000000000..ce44256f2244\n> --- /dev/null\n> +++ b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n> @@ -0,0 +1,9 @@\n> +// { dg-do compile { target c++26 } }\n> +\n> +// PR libstdc++/124890 - Circular constraint in std::indirect::operator==\n> +\n> +#include \n> +#include \n> +\n> +using I = std::vector>::iterator;\n> +static_assert(std::totally_ordered);\n> --\n> 2.54.0.rc1.54.g60f07c4f5c\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=fS/0B9hV;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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Fri, 17 Apr 2026\n 08:43:24 -0700 (PDT)"],"MIME-Version":"1.0","References":"<20260417154009.1140472-1-ppalka@redhat.com>","In-Reply-To":"<20260417154009.1140472-1-ppalka@redhat.com>","From":"Jonathan Wakely ","Date":"Fri, 17 Apr 2026 16:43:08 +0100","X-Gm-Features":"AQROBzBPbmS0tVN52yZU0jE4QErN8pHaVLAd0jxaUoC4y8f_stECn4ytGaINfqQ","Message-ID":"\n ","Subject":"Re: [PATCH] libstdc++: Fix constraint recursion in std:indirect's\n operator== [PR124890]","To":"Patrick Palka ","Cc":"gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"130_BZhtrDqmrqxmWg0hEA3z46raBzY0or2SBdA6gpc_1776440605","X-Mimecast-Originator":"redhat.com","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3678841,"web_url":"http://patchwork.ozlabs.org/comment/3678841/","msgid":"","list_archive_url":null,"date":"2026-04-17T17:02:52","subject":"Re: [PATCH] libstdc++: Fix constraint recursion in std:indirect's\n operator== [PR124890]","submitter":{"id":78319,"url":"http://patchwork.ozlabs.org/api/people/78319/","name":"Patrick Palka","email":"ppalka@redhat.com"},"content":"On Fri, 17 Apr 2026, Jonathan Wakely wrote:\n\n> On Fri, 17 Apr 2026 at 16:40, Patrick Palka wrote:\n> >\n> > Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n> \n> OK, thanks.\n> \n> >\n> > We can also just implement the Mandates as a static_assert as pointed\n> > out by Lénárd. Otherwise, I prefer this approach rather than the\n> > forwarding reference approach since it's cleaner and we use this approach\n> > in other parts of the library with no complaints so far.\n> >\n> > -- >8 --\n> >\n> > Like in r16-559 for std::expected, std::indirect's operator== is also\n> > prone to constraint recursion due to CWG 2369. This patch works around\n> > the recursion in a similar manner.\n> >\n> > PR libstdc++/124890\n> > PR libstdc++/119714\n> > PR libstdc++/112490\n> >\n> > libstdc++-v3/ChangeLog:\n> >\n> > * include/bits/indirect.h (indirect::operator==): Replace\n> > non-dependent std::indirect function parameter with a\n> > dependent one of type indirect<_Tp2> where _Tp2 matches _Tp.\n> > * testsuite/std/memory/indirect/124890.cc: New test.\n> > ---\n> > libstdc++-v3/include/bits/indirect.h | 4 ++--\n> > libstdc++-v3/testsuite/std/memory/indirect/124890.cc | 9 +++++++++\n> > 2 files changed, 11 insertions(+), 2 deletions(-)\n> > create mode 100644 libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n> >\n> > diff --git a/libstdc++-v3/include/bits/indirect.h b/libstdc++-v3/include/bits/indirect.h\n> > index 2df46cc39a21..e1f7d1968b56 100644\n> > --- a/libstdc++-v3/include/bits/indirect.h\n> > +++ b/libstdc++-v3/include/bits/indirect.h\n> > @@ -344,11 +344,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n> > return __lhs.__get() == __rhs.__get();\n> > }\n> >\n> > - template\n> > + template _Tp2, typename _Up>\n> > requires (!__is_indirect<_Up>) // See PR c++/99599\n> > && requires (const _Tp& __t, const _Up& __u) { __t == __u; }\n> > friend constexpr bool\n> > - operator==(const indirect& __lhs, const _Up& __rhs)\n> > + operator==(const indirect<_Tp2>& __lhs, const _Up& __rhs)\n\nOops, forgot to pass the _Alloc parameter here. Here's what I ended up\npushing:\n\n-- >8 --\n\nSubject: [PATCH] libstdc++: Fix constraint recursion in std::indirect's\n operator== [PR124890]\n\nLike in r16-559 for std::expected, std::indirect's operator== is also\nprone to constraint recursion due to CWG 2369, for the Mandates that we\nimplement as an associated constraint. This patch works around the\nrecursion in a similar manner as done for std::expected (and\nstd::basic_const_iterator).\n\n\tPR libstdc++/124890\n\tPR libstdc++/119714\n\tPR libstdc++/112490\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/indirect.h (indirect::operator==): Replace\n\tnon-dependent std::indirect function parameter with a\n\tdependent one of type indirect<_Vp> where _Vp matches _Tp.\n\t* testsuite/std/memory/indirect/124890.cc: New test.\n\nReviewed-by: Jonathan Wakely \n---\n libstdc++-v3/include/bits/indirect.h | 4 ++--\n libstdc++-v3/testsuite/std/memory/indirect/124890.cc | 9 +++++++++\n 2 files changed, 11 insertions(+), 2 deletions(-)\n create mode 100644 libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n\ndiff --git a/libstdc++-v3/include/bits/indirect.h b/libstdc++-v3/include/bits/indirect.h\nindex 2df46cc39a21..6490a77a5079 100644\n--- a/libstdc++-v3/include/bits/indirect.h\n+++ b/libstdc++-v3/include/bits/indirect.h\n@@ -344,11 +344,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n \t return __lhs.__get() == __rhs.__get();\n \t}\n \n- template\n+ template _Vp>\n \trequires (!__is_indirect<_Up>) // See PR c++/99599\n \t && requires (const _Tp& __t, const _Up& __u) { __t == __u; }\n \tfriend constexpr bool\n-\toperator==(const indirect& __lhs, const _Up& __rhs)\n+\toperator==(const indirect<_Vp, _Alloc>& __lhs, const _Up& __rhs)\n \tnoexcept(noexcept(*__lhs == __rhs))\n \t{\n \t if (!__lhs._M_objp)\ndiff --git a/libstdc++-v3/testsuite/std/memory/indirect/124890.cc b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\nnew file mode 100644\nindex 000000000000..ce44256f2244\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n@@ -0,0 +1,9 @@\n+// { dg-do compile { target c++26 } }\n+\n+// PR libstdc++/124890 - Circular constraint in std::indirect::operator==\n+\n+#include \n+#include \n+\n+using I = std::vector>::iterator;\n+static_assert(std::totally_ordered);","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=jNFo+0Wo;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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