3 ms·
Clever use of `__VA_ARGS__`! Does gcc remove `_a` as well? Well, may be it was just my implementation: #define mkmacro(func, ...) mkmacro_(func, VA_NUM_ARGS(
by bakul 7y ago
Clever use of `__VA_ARGS__`! Does gcc remove `_a` as well? Well, may be it was just my implementation:
#define mkmacro(func, ...) mkmacro_(func, VA_NUM_ARGS(__VA_ARGS__))
#define mkmacro_(func, nargs) mkmacro__(func, nargs)
#define mkmacro__(func, nargs) func ## nargs
#define DO(...) mkmacro(DO, __VA_ARGS__)(__VA_ARGS__)
#define DO1(n) for(I i=0;i<(n); i++)
#define DO2(m,n) DO1(m) for(I j=0;j<(n);j++)
#define DO3(l,m,n) DO2(l,m) for(I k=0;k<(n);k++)
- bakul 7y agoI just noticed two missing defines. Sorry about that. Fixed below. I did some testing and seems like this generates much less code at least with clang (with -O3 -fomit-frame-pointer) than geocar's much briefer solution! #define VA_NUM_ARGS(...) \ VA_NUM_ARGS_IMPL(__VA_ARGS__,5,4,3,2,1) #define VA_NUM_ARGS_IMPL(_1,_2,_3,_4,_5,N,...) N #define mkmacro(func, ...) \ mkmacro_(func, VA_NUM_ARGS(__VA_ARGS__)) #define mkmacro_(func, nargs) mkmacro__(func, nargs) #define mkmacro__(func, nargs) func ## nargs #define DO(...) mkmacro(DO, __VA_ARGS__)(__VA_ARGS__) #define DO1(n) for(I i=0;i<(n); i++) #define DO2(m,n) DO1(m) for(I j=0;j<(n);j++) #define DO3(l,m,n) DO2(l,m) for(I k=0;k<(n);k++)