From 648f6fd23e236d3726f5976339d150f6108a9ab0 Mon Sep 17 00:00:00 2001
From: joaquintides <joaquin@tid.es>
Date: Tue, 30 Apr 2024 17:32:53 +0200
Subject: [PATCH] protected cumulative_stats against count wraparound

---
 include/boost/unordered/detail/cumulative_stats.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/boost/unordered/detail/cumulative_stats.hpp b/include/boost/unordered/detail/cumulative_stats.hpp
index 8be500c1..288f752c 100644
--- a/include/boost/unordered/detail/cumulative_stats.hpp
+++ b/include/boost/unordered/detail/cumulative_stats.hpp
@@ -77,8 +77,12 @@ public:
     static_assert(
       sizeof...(Ts)==N,"A sample must be provided for each sequence.");
 
+    if(BOOST_UNLIKELY(++n==0)){ /* wraparound */
+      reset();
+      n=1;
+    }
     mp11::tuple_transform(
-      welfords_algorithm{++n},
+      welfords_algorithm{n},
       std::forward_as_tuple(std::forward<Ts>(xs)...),
       data);
   }