fix header issue

hitsz-ids · Aug 21, 2023 · 2002e2a · 2002e2a
1 parent cc2142b
commit 2002e2a
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/include/hsmc/instrument.h b/include/hsmc/instrument.h
@@ -16,6 +16,7 @@
 
 #include <chrono>
 #include <utility>
+#include <functional>
 #include "exception.h"
 
 namespace hsmc {