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macrohax: add some argument-counting macros

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Andrei Alexeyev 2021-08-12 18:58:53 +03:00
parent 373edc33ba
commit d89d0896e2
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1 changed files with 32 additions and 0 deletions
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32
src/util/macrohax.h
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@ -21,4 +21,36 @@
#define MACROHAX_ADDLINENUM(a) MACROHAX_EXPAND(MACROHAX_DEFER(MACROHAX_CONCAT)(a, __LINE__))
#define MACROHAX_STRINGIFY(x) #x
// Expands to 0 if argument list is empty, 1 otherwise.
// Up to 32 arguments supported.
#define MACROHAX_HASARGS(...) \
MACROHAX_EXPAND(MACROHAX_DEFER(MACROHAX_ARGCOUNT_HELPER)(\
_, ##__VA_ARGS__, MACROHAX_HASARGS_RSEQ_N() \
))
// Expands to the number of its arguments.
// Up to 32 arguments supported.
#define MACROHAX_NARGS(...) \
MACROHAX_EXPAND(MACROHAX_DEFER(MACROHAX_ARGCOUNT_HELPER)(\
_, ##__VA_ARGS__, MACROHAX_NARGS_RSEQ_N() \
))
#define MACROHAX_HASARGS_RSEQ_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, 0,
#define MACROHAX_NARGS_RSEQ_N() \
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 MACROHAX_ARGCOUNT_HELPER(_0, \
__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, N, ...) N
#endif // IGUARD_util_macrohax_h