fix a missing include

50e679d5 · Bensong Liu · 196dcdb3 · 50e679d5
Unverified Commit 50e679d5 authored 4 years ago by Bensong Liu
--- a/functional.hpp
+++ b/functional.hpp
@@ -9,6 +9,7 @@
 #include <list>
 #include <functional>
 #include <chrono>
+#include <stdexcept>

 namespace rlib {
    namespace impl {