ios - EXC_BAD_ACCESS 尝试返回 uint64_t 数字时

Question

当我尝试记录此函数的结果时，我一直收到 EXC_BAD_ACCESS 吗？我做错了什么？

-(uint64_t) rand64bitNum {
    uint32_t left = arc4random();
    uint32_t right = arc4random();
    uint64_t randNum = 0;
    memcpy(&randNum, &left, sizeof(left));
    uint16_t offset = sizeof(left);
    memcpy(&randNum+offset, &right, sizeof(right));
    return randNum;
}

Answer 1

&randnum+offset 并不像您认为的那样；指针加法以被指向的事物为单位执行。所以你可能需要 (char *)&randnum + offset。