From bd2b756986f5eafb41ff5bc07fd0e4d91c2a93af Mon Sep 17 00:00:00 2001
From: Vassil Vassilev <v.g.vassilev@gmail.com>
Date: Fri, 17 Jul 2020 22:02:18 +0300
Subject: [PATCH] Add missing include (#212)

This patch allows the header to be built standalone, as part of clang C++ modules builds.
---
 include/boost/serialization/hash_map.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/boost/serialization/hash_map.hpp b/include/boost/serialization/hash_map.hpp
index 39e98e64..ed3f765d 100644
--- a/include/boost/serialization/hash_map.hpp
+++ b/include/boost/serialization/hash_map.hpp
@@ -25,6 +25,7 @@
 #include <boost/serialization/hash_collections_save_imp.hpp>
 #include <boost/serialization/hash_collections_load_imp.hpp>
 #include <boost/serialization/split_free.hpp>
+#include <boost/serialization/detail/stack_constructor.hpp>
 #include <boost/move/utility_core.hpp>
 
 namespace boost {