Vector: Unhandled exception at 0x00066314 in AccountServer.exe: 0xC0000005: Access violation reading location 0xccccccd0

class Connection 
{
public:
  explicit Connection(boost::asio::io_service& io_service);
  virtual ~Connection();
  boost::asio::ip::tcp::socket& socket();

  virtual void OnConnected()=0;
  void Send(uint8_t* buffer, int length);
  bool Receive();
private:
  void handler(const boost::system::error_code& error, std::size_t bytes_transferred );
  boost::asio::ip::tcp::socket socket_;
};
-----------------------------------------------------------------------------------
Server::Server(boost::asio::io_service& io_service,short port)
    : acceptor_(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)){
      m_connections = new std::vector<Connection*>();           
      start_accept();


        std::cout<<"Socket accepting connections..."<<std::开发者_开发知识库endl;
}

Server::~Server()
{
    m_connections->clear();
    delete m_connections;
}

void Server::start_accept(){

   /* Connection::pointer new_connection =
      Connection::create(acceptor_.io_service());*/

    acceptor_.async_accept(m_connections->front()->socket(),
        boost::bind(&Server::handle_accept, this, m_connections,
          boost::asio::placeholders::error));

}

it builds the project with no errors but when am trying to run the program it's break and gives me this error

Unhandled exception at 0x00066314 in AccountServer.exe: 0xC0000005: Access violation reading location 0xccccccd0.

what's wrong here?!

Assuming Visual C++ here, I think this question may be related; you are trying to dereference an uninitialized pointer on the stack.

Specifically, you are invoking start_accept() before you initialize the pointer to the vector; apparently, your Server object lives on the stack, and the first field in the vector structure to be accessed lives at offset 4.

This line

m_connections = new std::vector<Connection*>(); 

create a vector of pointers. When are the pointers initalized?

Here they are assumed to point to someting with a socket()

acceptor_.async_accept(m_connections->front()->socket(),