strings don't really work

[rhulha]

I found this out much too late...

int main(int argc, char* argv[])
{
    char *foo = "foo";
    char *missing = "missing";
    hashset_t set = hashset_create();

    if (set == NULL) {
        fprintf(stderr, "failed to create hashset instance\n");
        abort();
    }

    hashset_add(set, foo);
    printf("%d\n", hashset_is_member(set, foo));
    printf("%d\n", hashset_is_member(set, _strdup(foo));
}

This will print
1
0

[elfprince13]

The red flag here should have been that you weren't asked to provide your own hash function. That means it can only possibly be hashing the pointer.