diff -urN jetstream-org/HashSet.cpp jetstream/HashSet.cpp
--- jetstream-org/HashSet.cpp	2020-10-30 04:12:42.000000000 +0800
+++ jetstream/HashSet.cpp	2022-01-24 17:11:08.619831711 +0800
@@ -24,6 +24,7 @@
 #include <memory>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/time.h>
 
 // Compile with: xcrun clang++ -o HashSet HashSet.cpp -O2 -W -framework Foundation -licucore -std=c++11 -fvisibility=hidden -DNDEBUG=1
@@ -76,7 +77,7 @@
 inline ToType bitwise_cast(FromType from)
 {
     typename std::remove_const<ToType>::type to { };
-    std::memcpy(&to, &from, sizeof(to));
+    memcpy(&to, &from, sizeof(to));
     return to;
 }