From 7d0e0b9ed464c4e14ee0d3fbdb8900e085971054 Mon Sep 17 00:00:00 2001
From: Dave Amiana <amianism25@gmail.com>
Date: Tue, 4 Jun 2024 20:59:04 +0800
Subject: [PATCH] added functional header

---
 include/rsymbol.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/rsymbol.hpp b/include/rsymbol.hpp
index ab2761b..3e610b6 100644
--- a/include/rsymbol.hpp
+++ b/include/rsymbol.hpp
@@ -1,6 +1,7 @@
 #ifndef __RSYMBOL_H__
 #define __RSYMBOL_H__
 
+#include <functional>
 #include <map>
 #include <type_traits>