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#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
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