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- #define PP_ARG_N( \
- _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
- _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
- _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
- _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
- _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
- _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
- _61, _62, _63, N, ...) N
- #define PP_RSEQ_N() \
- 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 PP_NARG_(...) PP_ARG_N(__VA_ARGS__)
- #define PP_COMMASEQ_N() \
- 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
- 1, 1, 1, 1, 1, 1, 1, 1, 0, 0
- #define PP_COMMA() ,
- #define PP_HASCOMMA(...) \
- PP_NARG_(__VA_ARGS__, PP_COMMASEQ_N())
- #define PP_NARG(...) \
- PP_NARG_HELPER1( \
- PP_HASCOMMA(__VA_ARGS__), \
- PP_HASCOMMA(PP_COMMA __VA_ARGS__ ()), \
- PP_NARG_(__VA_ARGS__, PP_RSEQ_N()))
- #define PP_NARG_HELPER1(a, b, N) PP_NARG_HELPER2(a, b, N)
- #define PP_NARG_HELPER2(a, b, N) PP_NARG_HELPER3_ ## a ## b(N)
- #define PP_NARG_HELPER3_01(N) 0
- #define PP_NARG_HELPER3_00(N) 1
- #define PP_NARG_HELPER3_11(N) N
- // ----=====================================================================----
- // Test
- // ----=====================================================================----
- #include <iostream>
- using namespace std;
- int main()
- {
- cout << PP_NARG(1) << endl;
- }
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