public inbox for libstdc++-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r13-6816] libstdc++: Fix assigning nullptr to std::atomic<shared_ptr<T>> (LWG 3893)
@ 2023-03-22 23:26 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2023-03-22 23:26 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:a495b738e4a89a8104798d005fd09474bbb916ff
commit r13-6816-ga495b738e4a89a8104798d005fd09474bbb916ff
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Mar 22 21:54:24 2023 +0000
libstdc++: Fix assigning nullptr to std::atomic<shared_ptr<T>> (LWG 3893)
LWG voted this to Tentatively Ready recently.
libstdc++-v3/ChangeLog:
* include/bits/shared_ptr_atomic.h (atomic::operator=(nullptr_t)):
Add overload, as per LWG 3893.
* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
Check assignment from nullptr.
Diff:
---
libstdc++-v3/include/bits/shared_ptr_atomic.h | 6 ++++++
.../testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/libstdc++-v3/include/bits/shared_ptr_atomic.h b/libstdc++-v3/include/bits/shared_ptr_atomic.h
index d142616f485..2295b48e732 100644
--- a/libstdc++-v3/include/bits/shared_ptr_atomic.h
+++ b/libstdc++-v3/include/bits/shared_ptr_atomic.h
@@ -650,6 +650,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
operator=(shared_ptr<_Tp> __desired) noexcept
{ _M_impl.swap(__desired, memory_order_seq_cst); }
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 3893. LWG 3661 broke atomic<shared_ptr<T>> a; a = nullptr;
+ void
+ operator=(nullptr_t) noexcept
+ { store(nullptr); }
+
shared_ptr<_Tp>
exchange(shared_ptr<_Tp> __desired,
memory_order __o = memory_order_seq_cst) noexcept
diff --git a/libstdc++-v3/testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc b/libstdc++-v3/testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc
index a1902745a3e..54cf2621ea1 100644
--- a/libstdc++-v3/testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc
+++ b/libstdc++-v3/testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc
@@ -145,6 +145,14 @@ test_counting()
VERIFY( counter == 2 );
}
+void
+test_lwg3893()
+{
+ // LWG 3893. LWG 3661 broke atomic<shared_ptr<T>> a; a = nullptr;
+ std::atomic<std::shared_ptr<int>> a;
+ a = nullptr;
+}
+
int
main()
{
@@ -152,4 +160,5 @@ main()
test_atomic_shared_ptr();
test_wait_notify();
test_counting();
+ test_lwg3893();
}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-03-22 23:26 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-22 23:26 [gcc r13-6816] libstdc++: Fix assigning nullptr to std::atomic<shared_ptr<T>> (LWG 3893) Jonathan Wakely
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).