2 年之前 · 7c06be7749
--- a/include/serializer/jsonizer.h
+++ b/include/serializer/jsonizer.h
@@ -9,6 +9,7 @@
 
				 
			
 
				 #include <iosfwd>
			
 
				 #include <memory>
			
 
				+#include <optional>
			
 
				 #include <string>
			
 
				 
			
 
				 #include <json/forwards.h>