passing an array of structures (containing two mpz_t numbers) to a function
- by jerome
Hello, I'm working on some project where I use the type mpz_t from the GMP C library. I have some problems passing an array of structures (containing mpz_ts) adress to a function :
I wille try to explain my problem with some code.
So here is the structure :
struct mpz_t2{
mpz_t a;
mpz_t b;
};
typedef struct mpz_t2 *mpz_t2;
void
petit_test(mpz_t2 *test[])
{
printf("entering petit test function\n");
for (int i=0; i < 4; i++)
{
gmp_printf("test[%d]->a = %Zd and test[%d]->b = %Zd\n", test[i]->a, test[i]->b);
}
}
/* IN MAIN FUNCTION */
mpz_t2 *test = malloc(4 * sizeof(mpz_t2 *));
for (int i=0; i < 4; i++)
{
mpz_t2_init(&test[i]); // if I pass test[i] : compiler error
mpz_set_ui(test[i].a, i); //if test[i]->a compiler error
mpz_set_ui(test[i].b, i*10); //same problem
gmp_printf("%Zd\n", test[i].b); //prints correct result
}
petit_test(test);
The programm prints the expected result (in main) but after entering the petit_test function produces a segmentation fault error.
I would need to edit the mpz_t2 structure array in petit_test.
I tried some other ways allocating and passing the array to the function but I didn't manage to get this right.
If someone has a solution to this problem, I would be very thankfull!
Regards,
jérôme.
