相关疑难解决方法(0)

当询问C中常见的未定义行为时,灵魂比我提到的严格别名规则更加开明.
他们在说什么？

考虑我有如下的结构:

struct Bitmask
{
  unsigned char payload_length: 7;
  unsigned char mask: 1;
  unsigned char opcode: 4;
  unsigned char rsv3: 1;
  unsigned char rsv2: 1;
  unsigned char rsv1: 1;
  unsigned char fin: 1;
};

const char* payload = "Hello";
const size_t payload_length = strlen(payload);

Bitmask* header = new Bitmask();
header->fin =1;
header->rsv1 = 0;
header->rsv2 = 0;
header->rsv3 = 0;
header->opcode = 1;
header->mask = 0;
header->payload_length = payload_length;

iovec iov[2];
iov[0].iov_base = (char*)header;
iov[0].iov_len = sizeof (header);
iov[1].iov_base = (char …