Add missing include

diff --git a/include/xbt/functional.hpp b/include/xbt/functional.hpp
index 1b3b6ea..49d33f4 100644 (file)
--- a/include/xbt/functional.hpp
+++ b/include/xbt/functional.hpp
@@ -16,6 +16,7 @@
 #include <memory>
 #include <string>
 #include <tuple>
+#include <type_traits>
 #include <utility>
 #include <vector>