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Diffstat (limited to 'chad/narg.h')
| -rw-r--r-- | chad/narg.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/chad/narg.h b/chad/narg.h new file mode 100644 index 0000000..a965e85 --- /dev/null +++ b/chad/narg.h @@ -0,0 +1,55 @@ +#ifndef NARG_H +#define NARG_H + +/* A common problem when writting comfortable interfaces is that you want variable arguments, + but without the baggage. + Passing a terminator or the argument count is error prone. + This is a convenience header exactly for that. + The idea is that you define your function to take the argument count: + `_my_comfy_interface(int n, ...)` + Then you wrap it with our macro magick: + `#define my_comfy_interface _my_comfy_interface(NARG(__VA_ARGS__), __VA_ARGS__)` + And it just werks™. +*/ + +#define NARG(...) \ + PP_NARG_(__VA_ARGS__,PP_RSEQ_N()) +#define PP_NARG_(...) \ + PP_128TH_ARG(__VA_ARGS__) +#define PP_128TH_ARG( \ + _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, _64, \ + _65, _66, _67, _68, _69, _70, _71, _72, \ + _73, _74, _75, _76, _77, _78, _79, _80, \ + _81, _82, _83, _84, _85, _86, _87, _88, \ + _89, _90, _91, _92, _93, _94, _95, _96, \ + _97, _98, _99,_100,_101,_102,_103,_104, \ + _105,_106,_107,_108,_109,_110,_111,_112, \ + _113,_114,_115,_116,_117,_118,_119,_120, \ + _121,_122,_123,_124,_125,_126,_127, N, ... \ + ) N +#define PP_RSEQ_N() \ + 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 + +#endif |