c++ - 无法初始化 vector C++

Question

SockeClient.h文件

#define SIZE_OF_BUFFER 4096

class SocketClient {

public:
    SocketClient(int cfd);
    virtual ~SocketClient();

    int recv();
    int getFd();

protected:
    int             m_fd;
    char            *m_buffer;
    vector<char>    m_vbuffer;

};

我正在尝试做

vector<char>    m_vbuffer(SIZE_OF_BUFFER);

我遇到语法错误...如何初始化大小为 4096 的 vector 。 提前致谢

Answer 1

使用成员初始化列表，在构造函数的定义中为:

class SocketClient {

public:
    SocketClient(int cfd) : m_vbuffer(SIZE_OF_BUFFER) 
    {                   //^^^^^^^^^^^^^^^^^^^^^^^^^^^ member-initialization-list

         //other code... 
    }


protected:
    int             m_fd;
    char            *m_buffer;
    vector<char>    m_vbuffer;

};

---

您可以使用 member-initialization-list 将许多成员初始化为:

class A
{
  std::string s;
  int a;
  int *p;
  A(int x) : s("somestring"), a(x), p(new int[100])
  {
    //other code if any
  }
 ~A()
  {
     delete []p; //must deallocate the memory!
  }
};