Add CppCon2018 chat server example and video

example/cppcon2018/main.cpp

@@ -0,0 +1,65 @@
+//
+// Copyright (c) 2018 Vinnie Falco (vinnie dot falco at gmail 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)
+//
+// Official repository: https://github.com/vinniefalco/CppCon2018
+//
+
+//------------------------------------------------------------------------------
+/*
+    WebSocket chat server
+
+    This implements a multi-user chat room using WebSocket.
+*/
+//------------------------------------------------------------------------------
+
+#include "listener.hpp"
+#include "shared_state.hpp"
+#include <boost/asio/signal_set.hpp>
+#include <iostream>
+
+int
+main(int argc, char* argv[])
+{
+    // Check command line arguments.
+    if (argc != 4)
+    {
+        std::cerr <<
+            "Usage: websocket-chat-server <address> <port> <doc_root>\n" <<
+            "Example:\n" <<
+            "    websocket-chat-server 0.0.0.0 8080 .\n";
+        return EXIT_FAILURE;
+    }
+    auto address = net::ip::make_address(argv[1]);
+    auto port = static_cast<unsigned short>(std::atoi(argv[2]));
+    auto doc_root = argv[3];
+
+    // The io_context is required for all I/O
+    net::io_context ioc;
+
+    // Create and launch a listening port
+    std::make_shared<listener>(
+        ioc,
+        tcp::endpoint{address, port},
+        std::make_shared<shared_state>(doc_root))->run();
+
+    // Capture SIGINT and SIGTERM to perform a clean shutdown
+    net::signal_set signals(ioc, SIGINT, SIGTERM);
+    signals.async_wait(
+        [&ioc](boost::system::error_code const&, int)
+        {
+            // Stop the io_context. This will cause run()
+            // to return immediately, eventually destroying the
+            // io_context and any remaining handlers in it.
+            ioc.stop();
+        });
+
+    // Run the I/O service on the main thread
+    ioc.run();
+
+    // (If we get here, it means we got a SIGINT or SIGTERM)
+
+    return EXIT_SUCCESS;
+}