--- /dev/null
+#pragma once
+
+#include <cstdio>
+
+//#define DEBUG
+
+#if !defined(LOG) && defined(DEBUG)
+#define LOG(fmt, ...) do { fprintf(stderr, "%s() " fmt, __func__, ##__VA_ARGS__); } while (0)
+#else
+#define LOG(fmt, ...) do {} while (0)
+#endif