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-rw-r--r--3rdparty/asio/src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp135
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diff --git a/3rdparty/asio/src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp b/3rdparty/asio/src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp
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index 00000000000..b18e4b2f19e
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+++ b/3rdparty/asio/src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp
@@ -0,0 +1,135 @@
+//
+// async_tcp_echo_server.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 <cstdlib>
+#include <iostream>
+#include <memory>
+#include <utility>
+#include <asio.hpp>
+
+using asio::ip::tcp;
+
+// Define a helper macro to invoke ASIO_HANDLER_LOCATION with the current
+// file name, line number, and function name. For the function name, you might
+// also consider using __PRETTY_FUNCTION__, BOOST_CURRENT_FUNCTION, or a hand-
+// crafted name. For C++20 or later, you may also use std::source_location.
+#define HANDLER_LOCATION \
+ ASIO_HANDLER_LOCATION((__FILE__, __LINE__, __func__))
+
+class session
+ : public std::enable_shared_from_this<session>
+{
+public:
+ session(tcp::socket socket)
+ : socket_(std::move(socket))
+ {
+ }
+
+ void start()
+ {
+ HANDLER_LOCATION;
+
+ do_read();
+ }
+
+private:
+ void do_read()
+ {
+ HANDLER_LOCATION;
+
+ auto self(shared_from_this());
+ socket_.async_read_some(asio::buffer(data_, max_length),
+ [this, self](std::error_code ec, std::size_t length)
+ {
+ HANDLER_LOCATION;
+
+ if (!ec)
+ {
+ do_write(length);
+ }
+ });
+ }
+
+ void do_write(std::size_t length)
+ {
+ HANDLER_LOCATION;
+
+ auto self(shared_from_this());
+ asio::async_write(socket_, asio::buffer(data_, length),
+ [this, self](std::error_code ec, std::size_t /*length*/)
+ {
+ HANDLER_LOCATION;
+
+ if (!ec)
+ {
+ do_read();
+ }
+ });
+ }
+
+ tcp::socket socket_;
+ enum { max_length = 1024 };
+ char data_[max_length];
+};
+
+class server
+{
+public:
+ server(asio::io_context& io_context, short port)
+ : acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
+ {
+ do_accept();
+ }
+
+private:
+ void do_accept()
+ {
+ HANDLER_LOCATION;
+
+ acceptor_.async_accept(
+ [this](std::error_code ec, tcp::socket socket)
+ {
+ HANDLER_LOCATION;
+
+ if (!ec)
+ {
+ std::make_shared<session>(std::move(socket))->start();
+ }
+
+ do_accept();
+ });
+ }
+
+ tcp::acceptor acceptor_;
+};
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc != 2)
+ {
+ std::cerr << "Usage: async_tcp_echo_server <port>\n";
+ return 1;
+ }
+
+ asio::io_context io_context;
+
+ server s(io_context, std::atoi(argv[1]));
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << "\n";
+ }
+
+ return 0;
+}