--- /dev/null
+#ifndef MEMORYORDER_H
+#define MEMORYORDER_H
+#ifdef __cplusplus
+#include <cstddef>
+namespace std {
+#else
+#include <stddef.h>
+#include <stdbool.h>
+#endif
+
+
+typedef enum memory_order {
+ memory_order_relaxed, memory_order_acquire, memory_order_release,
+ memory_order_acq_rel, memory_order_seq_cst
+} memory_order;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif