[PATCH] PR libstdc++/100889: Fix wrong param type in atomic_ref<_Tp*>::wait

[Thomas Rodgers]

Fixes https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100889

libstdc++-v3/ChangeLog:

        * include/bits/atomic_base.h (atomic_ref<_Tp*>::wait):
        Change parameter type from _Tp to _Tp*.
        * testsuite/29_atomics/atomic_ref/deduction.cc: Add
        reproducer case from PR.
---
 libstdc++-v3/include/bits/atomic_base.h                   | 2 +-
 libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/atomic_base.h 
b/libstdc++-v3/include/bits/atomic_base.h
index 029b8ad65a9..20cf1343c58 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -1870,7 +1870,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #if __cpp_lib_atomic_wait
       _GLIBCXX_ALWAYS_INLINE void
-      wait(_Tp __old, memory_order __m = memory_order_seq_cst) const noexcept
+      wait(_Tp* __old, memory_order __m = memory_order_seq_cst) const noexcept
       { __atomic_impl::wait(_M_ptr, __old, __m); }
 
       // TODO add const volatile overload
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc 
b/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc
index 86395b0c2b0..ed46b430f7c 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc
@@ -34,6 +34,7 @@ test01()
   int* p = &i;
   std::atomic_ref a2(p);
   static_assert(std::is_same_v<decltype(a2), std::atomic_ref<int*>>);
+  a2.store(nullptr);
 
   struct X { } x;
   std::atomic_ref a3(x);
-- 
2.26.2