From 55725dbe7047d54e3cbeccf7c4fb27f6603e0f2e Mon Sep 17 00:00:00 2001
From: greg7mdp <greg7mdp@gmail.com>
Date: Sun, 12 Mar 2023 18:31:12 -0400
Subject: [PATCH] Improve check for `<shared_mutex>` existence

---
 parallel_hashmap/phmap_config.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/parallel_hashmap/phmap_config.h b/parallel_hashmap/phmap_config.h
index 9f32a81..ddebce8 100644
--- a/parallel_hashmap/phmap_config.h
+++ b/parallel_hashmap/phmap_config.h
@@ -313,7 +313,7 @@
     #endif
 #endif
 
-#if PHMAP_HAVE_CC17
+#if PHMAP_HAVE_CC17 && (!defined(__has_include) || __has_include(<shared_mutex>))
     #define PHMAP_HAVE_SHARED_MUTEX 1
 #endif