From c48be8298c27143c1a684c0cb9689c88d16f4b49 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 17 Mar 2023 11:39:55 +0000
Subject: [PATCH] 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.
---
libstdc++-v3/include/std/coroutine | 2 +-
.../testsuite/18_support/coroutines/hash.cc | 22 +++++++++++++++++++
2 files changed, 23 insertions(+), 1 deletion(-)
create mode 100644 libstdc++-v3/testsuite/18_support/coroutines/hash.cc
diff --git a/libstdc++-v3/include/std/coroutine b/libstdc++-v3/include/std/coroutine
index f6e65566f103..b0ca18949dbe 100644
--- a/libstdc++-v3/include/std/coroutine
+++ b/libstdc++-v3/include/std/coroutine
@@ -345,7 +345,7 @@ _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 000000000000..68e5e640477b
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/coroutines/hash.cc
@@ -0,0 +1,22 @@
+// { dg-options "-std=gnu++2a" }
+// { dg-do run { target c++2a } }
+
+#include <coroutine>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::hash<std::noop_coroutine_handle> h;
+ std::size_t v = h(std::noop_coroutine());
+
+ const auto& ch = h;
+ std::size_t v2 = h(std::noop_coroutine()); // PR libstdc++/109165
+
+ VERIFY( v2 == v );
+}
+
+int main()
+{
+ test01();
+}
--
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