+#endif
+
+#if __cplusplus >= 201703L
+# define YS_MAYBE_UNUSED [[maybe_unused]];
+#elif defined(__GNUC__) || defined(__clang__)
+# define YS_MAYBE_UNUSED __attribute__((__unused__))
+#else
+# define YS_MAYBE_UNUSED
+#endif
+
+#if __cplusplus >= 201703L
+# define YS_FALLTHROUGH [[fallthrough]];
+#elif defined(__clang__)
+# define YS_FALLTHROUGH [[clang::fallthrough]];
+#elif defined(__GNUC__)
+# define YS_FALLTHROUGH [[gnu::fallthrough]];
+#else
+# define YS_FALLTHROUGH