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-rw-r--r--3rdparty/asio/src/examples/cpp17/Makefile.am37
-rw-r--r--3rdparty/asio/src/examples/cpp17/Makefile.in738
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/chat_server.cpp222
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server.cpp76
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_single_default.cpp71
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_tuple_default.cpp71
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_default.cpp73
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/range_based_for.cpp102
-rw-r--r--3rdparty/asio/src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp80
9 files changed, 1470 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp17/Makefile.am b/3rdparty/asio/src/examples/cpp17/Makefile.am
new file mode 100644
index 00000000000..c3a571c02f4
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/Makefile.am
@@ -0,0 +1,37 @@
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+libasio_a_SOURCES += ../../asio_ssl.cpp
+endif
+LDADD = libasio.a
+endif
+
+if HAVE_COROUTINES
+noinst_PROGRAMS = \
+ coroutines_ts/chat_server \
+ coroutines_ts/echo_server \
+ coroutines_ts/echo_server_with_default \
+ coroutines_ts/echo_server_with_as_single_default \
+ coroutines_ts/echo_server_with_as_tuple_default \
+ coroutines_ts/refactored_echo_server
+endif
+
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+
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+coroutines_ts_echo_server_SOURCES = coroutines_ts/echo_server.cpp
+coroutines_ts_echo_server_with_default_SOURCES = coroutines_ts/echo_server_with_default.cpp
+coroutines_ts_echo_server_with_as_single_default_SOURCES = coroutines_ts/echo_server_with_as_single_default.cpp
+coroutines_ts_echo_server_with_as_tuple_default_SOURCES = coroutines_ts/echo_server_with_as_tuple_default.cpp
+coroutines_ts_refactored_echo_server_SOURCES = coroutines_ts/refactored_echo_server.cpp
+endif
+
+EXTRA_DIST = \
+ coroutines_ts/range_based_for.cpp
+
+MAINTAINERCLEANFILES = \
+ $(srcdir)/Makefile.in
diff --git a/3rdparty/asio/src/examples/cpp17/Makefile.in b/3rdparty/asio/src/examples/cpp17/Makefile.in
new file mode 100644
index 00000000000..db35ec4f320
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/Makefile.in
@@ -0,0 +1,738 @@
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diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/chat_server.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/chat_server.cpp
new file mode 100644
index 00000000000..cd5fba32486
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/chat_server.cpp
@@ -0,0 +1,222 @@
+//
+// chat_server.cpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <deque>
+#include <iostream>
+#include <list>
+#include <memory>
+#include <set>
+#include <string>
+#include <utility>
+#include <asio/awaitable.hpp>
+#include <asio/detached.hpp>
+#include <asio/co_spawn.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/read_until.hpp>
+#include <asio/redirect_error.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/steady_timer.hpp>
+#include <asio/use_awaitable.hpp>
+#include <asio/write.hpp>
+
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::redirect_error;
+using asio::use_awaitable;
+
+//----------------------------------------------------------------------
+
+class chat_participant
+{
+public:
+ virtual ~chat_participant() {}
+ virtual void deliver(const std::string& msg) = 0;
+};
+
+typedef std::shared_ptr<chat_participant> chat_participant_ptr;
+
+//----------------------------------------------------------------------
+
+class chat_room
+{
+public:
+ void join(chat_participant_ptr participant)
+ {
+ participants_.insert(participant);
+ for (auto msg: recent_msgs_)
+ participant->deliver(msg);
+ }
+
+ void leave(chat_participant_ptr participant)
+ {
+ participants_.erase(participant);
+ }
+
+ void deliver(const std::string& msg)
+ {
+ recent_msgs_.push_back(msg);
+ while (recent_msgs_.size() > max_recent_msgs)
+ recent_msgs_.pop_front();
+
+ for (auto participant: participants_)
+ participant->deliver(msg);
+ }
+
+private:
+ std::set<chat_participant_ptr> participants_;
+ enum { max_recent_msgs = 100 };
+ std::deque<std::string> recent_msgs_;
+};
+
+//----------------------------------------------------------------------
+
+class chat_session
+ : public chat_participant,
+ public std::enable_shared_from_this<chat_session>
+{
+public:
+ chat_session(tcp::socket socket, chat_room& room)
+ : socket_(std::move(socket)),
+ timer_(socket_.get_executor()),
+ room_(room)
+ {
+ timer_.expires_at(std::chrono::steady_clock::time_point::max());
+ }
+
+ void start()
+ {
+ room_.join(shared_from_this());
+
+ co_spawn(socket_.get_executor(),
+ [self = shared_from_this()]{ return self->reader(); },
+ detached);
+
+ co_spawn(socket_.get_executor(),
+ [self = shared_from_this()]{ return self->writer(); },
+ detached);
+ }
+
+ void deliver(const std::string& msg)
+ {
+ write_msgs_.push_back(msg);
+ timer_.cancel_one();
+ }
+
+private:
+ awaitable<void> reader()
+ {
+ try
+ {
+ for (std::string read_msg;;)
+ {
+ std::size_t n = co_await asio::async_read_until(socket_,
+ asio::dynamic_buffer(read_msg, 1024), "\n", use_awaitable);
+
+ room_.deliver(read_msg.substr(0, n));
+ read_msg.erase(0, n);
+ }
+ }
+ catch (std::exception&)
+ {
+ stop();
+ }
+ }
+
+ awaitable<void> writer()
+ {
+ try
+ {
+ while (socket_.is_open())
+ {
+ if (write_msgs_.empty())
+ {
+ asio::error_code ec;
+ co_await timer_.async_wait(redirect_error(use_awaitable, ec));
+ }
+ else
+ {
+ co_await asio::async_write(socket_,
+ asio::buffer(write_msgs_.front()), use_awaitable);
+ write_msgs_.pop_front();
+ }
+ }
+ }
+ catch (std::exception&)
+ {
+ stop();
+ }
+ }
+
+ void stop()
+ {
+ room_.leave(shared_from_this());
+ socket_.close();
+ timer_.cancel();
+ }
+
+ tcp::socket socket_;
+ asio::steady_timer timer_;
+ chat_room& room_;
+ std::deque<std::string> write_msgs_;
+};
+
+//----------------------------------------------------------------------
+
+awaitable<void> listener(tcp::acceptor acceptor)
+{
+ chat_room room;
+
+ for (;;)
+ {
+ std::make_shared<chat_session>(
+ co_await acceptor.async_accept(use_awaitable),
+ room
+ )->start();
+ }
+}
+
+//----------------------------------------------------------------------
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc < 2)
+ {
+ std::cerr << "Usage: chat_server <port> [<port> ...]\n";
+ return 1;
+ }
+
+ asio::io_context io_context(1);
+
+ for (int i = 1; i < argc; ++i)
+ {
+ unsigned short port = std::atoi(argv[i]);
+ co_spawn(io_context,
+ listener(tcp::acceptor(io_context, {tcp::v4(), port})),
+ detached);
+ }
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << "\n";
+ }
+
+ return 0;
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server.cpp
new file mode 100644
index 00000000000..a9532459f77
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server.cpp
@@ -0,0 +1,76 @@
+//
+// echo_server.cpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable;
+namespace this_coro = asio::this_coro;
+
+#if defined(ASIO_ENABLE_HANDLER_TRACKING)
+# define use_awaitable \
+ asio::use_awaitable_t(__FILE__, __LINE__, __PRETTY_FUNCTION__)
+#endif
+
+awaitable<void> echo(tcp::socket socket)
+{
+ try
+ {
+ char data[1024];
+ for (;;)
+ {
+ std::size_t n = co_await socket.async_read_some(asio::buffer(data), use_awaitable);
+ co_await async_write(socket, asio::buffer(data, n), use_awaitable);
+ }
+ }
+ catch (std::exception& e)
+ {
+ std::printf("echo Exception: %s\n", e.what());
+ }
+}
+
+awaitable<void> listener()
+{
+ auto executor = co_await this_coro::executor;
+ tcp::acceptor acceptor(executor, {tcp::v4(), 55555});
+ for (;;)
+ {
+ tcp::socket socket = co_await acceptor.async_accept(use_awaitable);
+ co_spawn(executor, echo(std::move(socket)), detached);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ co_spawn(io_context, listener(), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_single_default.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_single_default.cpp
new file mode 100644
index 00000000000..4a692acc872
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_single_default.cpp
@@ -0,0 +1,71 @@
+//
+// echo_server_with_as_single_default.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/experimental/as_single.hpp>
+#include <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::experimental::as_single_t;
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable_t;
+using default_token = as_single_t<use_awaitable_t<>>;
+using tcp_acceptor = default_token::as_default_on_t<tcp::acceptor>;
+using tcp_socket = default_token::as_default_on_t<tcp::socket>;
+namespace this_coro = asio::this_coro;
+
+awaitable<void> echo(tcp_socket socket)
+{
+ char data[1024];
+ for (;;)
+ {
+ auto [e1, nread] = co_await socket.async_read_some(asio::buffer(data));
+ if (nread == 0) break;
+ auto [e2, nwritten] = co_await async_write(socket, asio::buffer(data, nread));
+ if (nwritten != nread) break;
+ }
+}
+
+awaitable<void> listener()
+{
+ auto executor = co_await this_coro::executor;
+ tcp_acceptor acceptor(executor, {tcp::v4(), 55555});
+ for (;;)
+ {
+ if (auto [e, socket] = co_await acceptor.async_accept(); socket.is_open())
+ co_spawn(executor, echo(std::move(socket)), detached);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ co_spawn(io_context, listener(), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_tuple_default.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_tuple_default.cpp
new file mode 100644
index 00000000000..de162cad78e
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_as_tuple_default.cpp
@@ -0,0 +1,71 @@
+//
+// echo_server_with_as_tuple_default.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/as_tuple.hpp>
+#include <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::as_tuple_t;
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable_t;
+using default_token = as_tuple_t<use_awaitable_t<>>;
+using tcp_acceptor = default_token::as_default_on_t<tcp::acceptor>;
+using tcp_socket = default_token::as_default_on_t<tcp::socket>;
+namespace this_coro = asio::this_coro;
+
+awaitable<void> echo(tcp_socket socket)
+{
+ char data[1024];
+ for (;;)
+ {
+ auto [e1, nread] = co_await socket.async_read_some(asio::buffer(data));
+ if (nread == 0) break;
+ auto [e2, nwritten] = co_await async_write(socket, asio::buffer(data, nread));
+ if (nwritten != nread) break;
+ }
+}
+
+awaitable<void> listener()
+{
+ auto executor = co_await this_coro::executor;
+ tcp_acceptor acceptor(executor, {tcp::v4(), 55555});
+ for (;;)
+ {
+ if (auto [e, socket] = co_await acceptor.async_accept(); socket.is_open())
+ co_spawn(executor, echo(std::move(socket)), detached);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ co_spawn(io_context, listener(), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_default.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_default.cpp
new file mode 100644
index 00000000000..54344d94d56
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/echo_server_with_default.cpp
@@ -0,0 +1,73 @@
+//
+// echo_server_with_default.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable_t;
+using tcp_acceptor = use_awaitable_t<>::as_default_on_t<tcp::acceptor>;
+using tcp_socket = use_awaitable_t<>::as_default_on_t<tcp::socket>;
+namespace this_coro = asio::this_coro;
+
+awaitable<void> echo(tcp_socket socket)
+{
+ try
+ {
+ char data[1024];
+ for (;;)
+ {
+ std::size_t n = co_await socket.async_read_some(asio::buffer(data));
+ co_await async_write(socket, asio::buffer(data, n));
+ }
+ }
+ catch (std::exception& e)
+ {
+ std::printf("echo Exception: %s\n", e.what());
+ }
+}
+
+awaitable<void> listener()
+{
+ auto executor = co_await this_coro::executor;
+ tcp_acceptor acceptor(executor, {tcp::v4(), 55555});
+ for (;;)
+ {
+ auto socket = co_await acceptor.async_accept();
+ co_spawn(executor, echo(std::move(socket)), detached);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ co_spawn(io_context, listener(), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/range_based_for.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/range_based_for.cpp
new file mode 100644
index 00000000000..599ed80cd3f
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/range_based_for.cpp
@@ -0,0 +1,102 @@
+//
+// range_based_for.cpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable;
+
+class connection_iter
+{
+ friend class connections;
+ tcp::acceptor* acceptor_ = nullptr;
+ tcp::socket socket_;
+
+ connection_iter(tcp::acceptor& a, tcp::socket s)
+ : acceptor_(&a), socket_(std::move(s)) {}
+
+public:
+ tcp::socket operator*()
+ {
+ return std::move(socket_);
+ }
+
+ awaitable<void> operator++()
+ {
+ socket_ = co_await acceptor_->async_accept(use_awaitable);
+ }
+
+ bool operator==(const connection_iter&) const noexcept
+ {
+ return false;
+ }
+
+ bool operator!=(const connection_iter&) const noexcept
+ {
+ return true;
+ }
+};
+
+class connections
+{
+ tcp::acceptor& acceptor_;
+
+public:
+ explicit connections(tcp::acceptor& a) : acceptor_(a) {}
+
+ awaitable<connection_iter> begin()
+ {
+ tcp::socket s = co_await acceptor_.async_accept(use_awaitable);
+ co_return connection_iter(acceptor_, std::move(s));
+ }
+
+ connection_iter end()
+ {
+ return connection_iter(acceptor_,
+ tcp::socket(acceptor_.get_executor()));
+ }
+};
+
+awaitable<void> listener(tcp::acceptor acceptor)
+{
+ for co_await (tcp::socket s : connections(acceptor))
+ {
+ co_await asio::async_write(s, asio::buffer("hello\r\n", 7), use_awaitable);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ tcp::acceptor acceptor(io_context, {tcp::v4(), 55555});
+ co_spawn(io_context, listener(std::move(acceptor)), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}
diff --git a/3rdparty/asio/src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp b/3rdparty/asio/src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp
new file mode 100644
index 00000000000..dc7b03d86e2
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp
@@ -0,0 +1,80 @@
+//
+// refactored_echo_server.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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 <asio/co_spawn.hpp>
+#include <asio/detached.hpp>
+#include <asio/io_context.hpp>
+#include <asio/ip/tcp.hpp>
+#include <asio/signal_set.hpp>
+#include <asio/write.hpp>
+#include <cstdio>
+
+using asio::ip::tcp;
+using asio::awaitable;
+using asio::co_spawn;
+using asio::detached;
+using asio::use_awaitable;
+namespace this_coro = asio::this_coro;
+
+awaitable<void> echo_once(tcp::socket& socket)
+{
+ char data[128];
+ std::size_t n = co_await socket.async_read_some(asio::buffer(data), use_awaitable);
+ co_await async_write(socket, asio::buffer(data, n), use_awaitable);
+}
+
+awaitable<void> echo(tcp::socket socket)
+{
+ try
+ {
+ for (;;)
+ {
+ // The asynchronous operations to echo a single chunk of data have been
+ // refactored into a separate function. When this function is called, the
+ // operations are still performed in the context of the current
+ // coroutine, and the behaviour is functionally equivalent.
+ co_await echo_once(socket);
+ }
+ }
+ catch (std::exception& e)
+ {
+ std::printf("echo Exception: %s\n", e.what());
+ }
+}
+
+awaitable<void> listener()
+{
+ auto executor = co_await this_coro::executor;
+ tcp::acceptor acceptor(executor, {tcp::v4(), 55555});
+ for (;;)
+ {
+ tcp::socket socket = co_await acceptor.async_accept(use_awaitable);
+ co_spawn(executor, echo(std::move(socket)), detached);
+ }
+}
+
+int main()
+{
+ try
+ {
+ asio::io_context io_context(1);
+
+ asio::signal_set signals(io_context, SIGINT, SIGTERM);
+ signals.async_wait([&](auto, auto){ io_context.stop(); });
+
+ co_spawn(io_context, listener(), detached);
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::printf("Exception: %s\n", e.what());
+ }
+}