#ifndef VA_NARGS

#define VA_NARGS(...) VA_NARGS_SHIFT_COUNT(__VA_ARGS__, VA_NARGS_COUNTS)

#define VA_NARGS_COUNTS				\
  255, 254, 253, 252, 251, 250, 249, 248,	\
    247, 246, 245, 244, 243, 242, 241, 240,	\
    239, 238, 237, 236, 235, 234, 233, 232,	\
    231, 230, 229, 228, 227, 226, 225, 224,	\
    223, 222, 221, 220, 219, 218, 217, 216,	\
    215, 214, 213, 212, 211, 210, 209, 208,	\
    207, 206, 205, 204, 203, 202, 201, 200,	\
    199, 198, 197, 196, 195, 194, 193, 192,	\
    191, 190, 189, 188, 187, 186, 185, 184,	\
    183, 182, 181, 180, 179, 178, 177, 176,	\
    175, 174, 173, 172, 171, 170, 169, 168,	\
    167, 166, 165, 164, 163, 162, 161, 160,	\
    159, 158, 157, 156, 155, 154, 153, 152,	\
    151, 150, 149, 148, 147, 146, 145, 144,	\
    143, 142, 141, 140, 139, 138, 137, 136,	\
    135, 134, 133, 132, 131, 130, 129, 128,	\
    127, 126, 125, 124, 123, 122, 121, 120,	\
    119, 118, 117, 116, 115, 114, 113, 112,	\
    111, 110, 109, 108, 107, 106, 105, 104,	\
    103, 102, 101, 100, 99, 98, 97, 96,		\
    95, 94, 93, 92, 91, 90, 89, 88,		\
    87, 86, 85, 84, 83, 82, 81, 80,		\
    79, 78, 77, 76, 75, 74, 73, 72,		\
    71, 70, 69, 68, 67, 66, 65, 64,		\
    63, 62, 61, 60, 59, 58, 57, 56,		\
    55, 54, 53, 52, 51, 50, 49, 48,		\
    47, 46, 45, 44, 43, 42, 41, 40,		\
    39, 38, 37, 36, 35, 34, 33, 32,		\
    31, 30, 29, 28, 27, 26, 25, 24,		\
    23, 22, 21, 20, 19, 18, 17, 16,		\
    15, 14, 13, 12, 11, 10, 9, 8,		\
    7, 6, 5, 4, 3, 2, 1, 0

#define VA_NARGS_GET_COUNT(					\
		       _255, _254, _253, _252, _251, _250, _249, _248,	\
		       _247, _246, _245, _244, _243, _242, _241, _240,	\
		       _239, _238, _237, _236, _235, _234, _233, _232,	\
		       _231, _230, _229, _228, _227, _226, _225, _224,	\
		       _223, _222, _221, _220, _219, _218, _217, _216,	\
		       _215, _214, _213, _212, _211, _210, _209, _208,	\
		       _207, _206, _205, _204, _203, _202, _201, _200,	\
		       _199, _198, _197, _196, _195, _194, _193, _192,	\
		       _191, _190, _189, _188, _187, _186, _185, _184,	\
		       _183, _182, _181, _180, _179, _178, _177, _176,	\
		       _175, _174, _173, _172, _171, _170, _169, _168,	\
		       _167, _166, _165, _164, _163, _162, _161, _160,	\
		       _159, _158, _157, _156, _155, _154, _153, _152,	\
		       _151, _150, _149, _148, _147, _146, _145, _144,	\
		       _143, _142, _141, _140, _139, _138, _137, _136,	\
		       _135, _134, _133, _132, _131, _130, _129, _128,	\
		       _127, _126, _125, _124, _123, _122, _121, _120,	\
		       _119, _118, _117, _116, _115, _114, _113, _112,	\
		       _111, _110, _109, _108, _107, _106, _105, _104,	\
		       _103, _102, _101, _100, _99, _98, _97, _96,	\
		       _95, _94, _93, _92, _91, _90, _89, _88,		\
		       _87, _86, _85, _84, _83, _82, _81, _80,		\
		       _79, _78, _77, _76, _75, _74, _73, _72,		\
		       _71, _70, _69, _68, _67, _66, _65, _64,		\
		       _63, _62, _61, _60, _59, _58, _57, _56,		\
		       _55, _54, _53, _52, _51, _50, _49, _48,		\
		       _47, _46, _45, _44, _43, _42, _41, _40,		\
		       _39, _38, _37, _36, _35, _34, _33, _32,		\
		       _31, _30, _29, _28, _27, _26, _25, _24,		\
		       _23, _22, _21, _20, _19, _18, _17, _16,		\
		       _15, _14, _13, _12, _11, _10, _9, _8,		\
		       _7, _6, _5, _4, _3, _2, _1, N, ...) N

#define VA_NARGS_SHIFT_COUNT(...) VA_NARGS_GET_COUNT(__VA_ARGS__)

#endif