fixed includes

diff --git a/entities.hpp b/entities.hpp
index 4291e3fda330856587cafe9c2c1072c0fa0539a0..b7e5c0d7c85270faf9e9b5ba7b255e4f589bf508 100644 (file)
--- a/entities.hpp
+++ b/entities.hpp
@@ -6,10 +6,11 @@
 #define ENTITIES_HPP_
 
 #include <algorithm> // std::find_if
-#include <type_traits> // std::is_convertible
-#include <vector>
 #include <forward_list>
+#include <functional>
 #include <map>
+#include <type_traits> // std::is_convertible
+#include <vector>
 
 
 /**