From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <redi@sourceware.org>
Received: by sourceware.org (Postfix, from userid 2181)
	id 276783858C74; Mon, 20 Mar 2023 11:54:36 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 276783858C74
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1679313276;
	bh=HFfB9wHRtWc7l7pp9rntequkSWqQnhRgqbO8SvrVrcI=;
	h=From:To:Subject:Date:From;
	b=UXqwe8DnF3d4R8B3L8VvDaIuuvFXQFSb70jxW8tqfrC3z8iF4U+hZo/IXm3z6du8a
	 pI0/x6Z47lb5F65oDjP1NQi6NQsQfqpLRXq7c0mVozdT0AfwO4nN7G5l6LXcPHjMZy
	 3dPQc0Y7xwApdhgAFGxRAMAuCOTC+JA6ELOuzpec=
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="utf-8"
From: Jonathan Wakely <redi@gcc.gnu.org>
To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org
Subject: [gcc r12-9296] libstdc++: Add const to
 hash<coroutine_handle<P>>::operator() [PR109165]
X-Act-Checkin: gcc
X-Git-Author: Jonathan Wakely <jwakely@redhat.com>
X-Git-Refname: refs/heads/releases/gcc-12
X-Git-Oldrev: 9ccf471f8cc7341984f6613247f01d8ecfcb7ad5
X-Git-Newrev: 2a9e6f58c4d9d63dde6c4d53d10f686bf71fb435
Message-Id: <20230320115436.276783858C74@sourceware.org>
Date: Mon, 20 Mar 2023 11:54:36 +0000 (GMT)
List-Id: <libstdc++-cvs.sourceware.org>

https://gcc.gnu.org/g:2a9e6f58c4d9d63dde6c4d53d10f686bf71fb435

commit r12-9296-g2a9e6f58c4d9d63dde6c4d53d10f686bf71fb435
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Mar 17 11:39:55 2023 +0000

    libstdc++: Add const to hash<coroutine_handle<P>>::operator() [PR109165]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/109165
            * include/std/coroutine (hash<>::operator()): Add const.
            * testsuite/18_support/coroutines/hash.cc: New test.

Diff:
---
 libstdc++-v3/include/std/coroutine                 |  2 +-
 .../testsuite/18_support/coroutines/hash.cc        | 23 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/coroutine b/libstdc++-v3/include/std/coroutine
index f4189c7e3fc..47f0ab95c37 100644
--- a/libstdc++-v3/include/std/coroutine
+++ b/libstdc++-v3/include/std/coroutine
@@ -350,7 +350,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     struct hash<coroutine_handle<_Promise>>
     {
       size_t
-      operator()(const coroutine_handle<_Promise>& __h) noexcept
+      operator()(const coroutine_handle<_Promise>& __h) const noexcept
       {
 	return reinterpret_cast<size_t>(__h.address());
       }
diff --git a/libstdc++-v3/testsuite/18_support/coroutines/hash.cc b/libstdc++-v3/testsuite/18_support/coroutines/hash.cc
new file mode 100644
index 00000000000..81b68f8246a
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/coroutines/hash.cc
@@ -0,0 +1,23 @@
+// { dg-options "-std=gnu++2a" }
+// { dg-do run { target c++2a } }
+
+#include <coroutine>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  auto coro = std::noop_coroutine();
+  std::hash<std::noop_coroutine_handle> h;
+  std::size_t v = h(coro);
+
+  const auto& ch = h;
+  std::size_t v2 = ch(coro); // PR libstdc++/109165
+
+  VERIFY( v2 == v );
+}
+
+int main()
+{
+  test01();
+}