/prog/ - C halps — World4ch

Name: Anonymous 2008-03-19 17:18

How do I check what type of variable a variable is?

Something like;

if (typecheck(foo,int))

  {

  /* lol */

  }

Name: Anonymous 2008-03-20 5:49

>>25
Thanks, fixed it so it doesn't segfault:

char*

allocate_type(type, length)

char type;

unsigned int length;

{

    int* ret = malloc(length);

    *(ret - 3) = type; /* block size is stored at -2 and -1 */

    return ret;

}



int main(int argc, char* argv[])

{

    short* s = (short*)allocate_type('s', sizeof(short));

    long* l = (long*)allocate_type('l', sizeof(long));

    *s = 100; *l = 1000;

    int* p1 = s; int* p2 = l;

    printf("%c, %c\n", *(p1 - 3), *(p2 - 3));

    printf("%d, %ld\n", *s, *l);

    free(s); free(l);

    return 0;

}

C halps

1 Name: Anonymous 2008-03-19 17:18

45 Name: Anonymous 2008-03-20 5:49

Name: Anonymous 2008-03-19 17:18

Name: Anonymous 2008-03-20 5:49