added functional header

adeeconometrics · Jun 4, 2024 · 7d0e0b9 · 7d0e0b9
1 parent 10152f8
commit 7d0e0b9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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>