#include <iostream>

 #include <boost/asio.hpp>

 using namespace std;

 using namespace boost::asio;

 int main()

 {

     try

     {

         cout << "server start." << endl;

         io_service ios;

         ip::tcp::acceptor acc(ios,

             ip::tcp::endpoint(ip::tcp::v4(),));

         cout << acc.local_endpoint().address() << endl;

         while (true)

         {

             ip::tcp::socket sock(ios);

             acc.accept(sock);

             cout << "client:" ;

             cout << sock.remote_endpoint().address() << endl;

             sock.write_some(buffer("hello asio"));

         }

     }

     catch (std::exception& e)

     {

         cout << e.what() << endl;

     }

     return ;

 }

 #include <boost/asio.hpp>

 #include <iostream>

 using namespace std;

 using namespace boost::asio;

 void client(io_service &ios)

 {

     try

     {

         cout << "client start." << endl;

         ip::tcp::socket sock(ios);

         ip::tcp::endpoint ep(ip::address::from_string("127.0.0.1"),);

         sock.connect(ep);

         vector<char> str(,);

         sock.read_some(buffer(str));

         cout << "receive from " << sock.remote_endpoint().address();

         cout << &str[] << endl;

     }

     catch (std::exception& e)

     {

         cout << e.what() << endl;

     }

 }

 void print(const boost::system::error_code&)

 {

     cout << "test wait..." << endl;

 }

 int main()

 {

     io_service ios;

     deadline_timer at(ios, boost::posix_time::seconds());

     at.async_wait(print);

     cout << "it show before at exired" <<endl;

     ios.run();

     return ;

 }