Rosetta Code sockets c++

#include <boost/asio.hpp>
#include <iostream>
#include <stdexcept>

int main()
{
    try {
        boost::asio::io_service io_service;
        boost::asio::ip::tcp::socket sock(io_service);
        boost::asio::ip::tcp::resolver resolver(io_service);
        boost::asio::ip::tcp::resolver::query query("localhost", "4321");

        boost::asio::connect(sock, resolver.resolve(query));
        boost::asio::write(sock, boost::asio::buffer("Hello world socket\r\n"));
    } catch (const std::exception &e) {
        std::cout << "Error: " << e.what() << "\n";
    } catch (...) {
        std::cout << "Unknown error" << "\n";
    }
    return 0;
}