From b087f9fb5313057d40dbaab8c5c88c026bc01200 Mon Sep 17 00:00:00 2001
From: joaquintides <joaquin@tid.es>
Date: Mon, 11 Dec 2023 18:54:10 +0100
Subject: [PATCH] strengthened memory order for metadata manipulation

---
 .../boost/unordered/detail/foa/concurrent_table.hpp  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/boost/unordered/detail/foa/concurrent_table.hpp b/include/boost/unordered/detail/foa/concurrent_table.hpp
index 47994fd6..6186d9d7 100644
--- a/include/boost/unordered/detail/foa/concurrent_table.hpp
+++ b/include/boost/unordered/detail/foa/concurrent_table.hpp
@@ -205,6 +205,17 @@ private:
 template<typename Integral>
 struct atomic_integral
 {
+#if defined(BOOST_UNORDERED_LATCH_FREE)
+  operator Integral()const{return n.load();}
+  void operator=(Integral m){n.store(m);}
+  void operator|=(Integral m){n.fetch_or(m);}
+  void operator&=(Integral m){n.fetch_and(m);}
+
+  atomic_integral& operator=(atomic_integral const& rhs) {
+    n.store(rhs.n.load());
+    return *this;
+  }
+#else
   operator Integral()const{return n.load(std::memory_order_relaxed);}
   void operator=(Integral m){n.store(m,std::memory_order_relaxed);}
   void operator|=(Integral m){n.fetch_or(m,std::memory_order_relaxed);}
@@ -214,6 +225,7 @@ struct atomic_integral
     n.store(rhs.n.load(std::memory_order_relaxed),std::memory_order_relaxed);
     return *this;
   }
+#endif
 
   std::atomic<Integral> n;
 };