From 49790b932bcae450e867511057b57d3d9d8f29f5 Mon Sep 17 00:00:00 2001
From: Aditya Pillai <pilleye@meta.com>
Date: Mon, 12 May 2025 15:09:01 -0400
Subject: [PATCH] Use Py_REFCNT instead of ob_refcnt on Python 3.9 and above

---
 .../suite/indexing/detail/indexing_suite_detail.hpp       | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/boost/python/suite/indexing/detail/indexing_suite_detail.hpp b/include/boost/python/suite/indexing/detail/indexing_suite_detail.hpp
index eb8b81c0a3..d470e32d77 100644
--- a/include/boost/python/suite/indexing/detail/indexing_suite_detail.hpp
+++ b/include/boost/python/suite/indexing/detail/indexing_suite_detail.hpp
@@ -216,7 +216,13 @@ namespace boost { namespace python { namespace detail {
         {
             for (const_iterator i = proxies.begin(); i != proxies.end(); ++i)
             {
-                if ((*i)->ob_refcnt <= 0)
+                if (
+#if PY_VERSION_HEX < 0x03090000
+                (*i)->ob_refcnt
+#else
+                Py_REFCNT(*i)
+#endif
+                <= 0)
                 {
                     PyErr_SetString(PyExc_RuntimeError, 
                         "Invariant: Proxy vector in an inconsistent state");