+#ifdef _MSC_VER
+
+#define VA_NARGS_IMPL(_1, _2, _3, _4, _5, N, ...) N
+#define VA_NARGS(...) VA_NARGS_IMPL(X,##__VA_ARGS__, 4, 3, 2, 1, 0)
+#define VARARG_IMPL2(base, count, ...) base##count(__VA_ARGS__)
+#define VARARG_IMPL(base, count, ...) VARARG_IMPL2(base, count, __VA_ARGS__)
+#define VARARG(base, ...) VARARG_IMPL(base, VA_NARGS(__VA_ARGS__), __VA_ARGS__)
+
+#define FB_ONE_OR_NONE0() /* */
+#define FB_ONE_OR_NONE1(x) /* */
+#define FB_ONE_OR_NONE2(x, y) x
+#define FB_ONE_OR_NONE3(x, y, z) x
+#define FB_ONE_OR_NONE(...) VARARG(FB_ONE_OR_NONE, __VA_ARGS__)
+
+#else