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  1. #include <stdio.h>
  2.  
  3. #define PP_ARG_N( \
  4.           _1,  _2,  _3,  _4,  _5,  _6,  _7,  _8,  _9, _10, \
  5.          _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
  6.          _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
  7.          _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
  8.          _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
  9.          _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
  10.          _61, _62, _63, N, ...) N
  11.  
  12. #define PP_RSEQ_N()                                        \
  13.          63, 62, 61, 60,                                   \
  14.          59, 58, 57, 56, 55, 54, 53, 52, 51, 50,           \
  15.          49, 48, 47, 46, 45, 44, 43, 42, 41, 40,           \
  16.          39, 38, 37, 36, 35, 34, 33, 32, 31, 30,           \
  17.          29, 28, 27, 26, 25, 24, 23, 22, 21, 20,           \
  18.          19, 18, 17, 16, 15, 14, 13, 12, 11, 10,           \
  19.           9,  8,  7,  6,  5,  4,  3,  2,  1,  0
  20.  
  21. #define PP_NARG_(...)    PP_ARG_N(__VA_ARGS__)    
  22.  
  23. #define PP_NARG(...)     (sizeof(#__VA_ARGS__) - 1 ? PP_NARG_(__VA_ARGS__, PP_RSEQ_N()) : 0)
  24.  
  25. int main()
  26. {
  27.     printf("PP_NARG(1, 2) =\t%d\n", PP_NARG(1, 2));
  28.     printf("PP_NARG(1) =\t%d\n", PP_NARG(1));
  29.     printf("PP_NARG() =\t%d\n", PP_NARG());
  30.     return 0;
  31. }
Success #stdin #stdout 0.02s 1676KB
comments (?)
stdin 
Standard input is empty
stdout 
PP_NARG(1, 2) =	2
PP_NARG(1) =	1
PP_NARG() =	0
https://ideone.com/39f0K
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

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