...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
// // server.cpp // ~~~~~~~~~~ // // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #include <ctime> #include <iostream> #include <string> #include <boost/array.hpp> #include <boost/asio.hpp> using boost::asio::ip::udp; std::string make_daytime_string() { using namespace std; // For time_t, time and ctime; time_t now = time(0); return ctime(&now); } int main() { try { boost::asio::io_service io_service; udp::socket socket(io_service, udp::endpoint(udp::v4(), 13)); for (;;) { boost::array<char, 1> recv_buf; udp::endpoint remote_endpoint; boost::system::error_code error; socket.receive_from(boost::asio::buffer(recv_buf), remote_endpoint, 0, error); if (error && error != boost::asio::error::message_size) throw boost::system::system_error(error); std::string message = make_daytime_string(); boost::system::error_code ignored_error; socket.send_to(boost::asio::buffer(message), remote_endpoint, 0, ignored_error); } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; }