Re: [PATCH v2] _Generic.3: New page documenting _Generic()

[Alejandro Colomar <alx.manpages@gmail.com>]

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On 8/23/22 15:16, Alejandro Colomar wrote:
> I.e., AFAIK, my_imaxabs(++x) would only do the ++ once, right?  Is that 
> what you were suggesting?

If that's what you meant, the macro seems safe:

$ cat imaxabs.c
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#define my_imaxabs(j)  _Generic(INTMAX_C(0),  \
     long:           labs(j),                  \
     long long:      llabs(j)                  \
  /* long long long: lllabs(j) */              \
)

int
main(void)
{
     off_t  a;

     a = (intmax_t) -1;
     printf("imaxabs(%jd) == %jd\n", (intmax_t) -2, my_imaxabs(--a));

     exit(EXIT_SUCCESS);
}

$ cc -Wall -Wextra imaxabs.c
$ ./a.out
imaxabs(-2) == 2


Cheers,

Alex

-- 
Alejandro Colomar
<http://www.alejandro-colomar.es/>

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