summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp
diff options
context:
space:
mode:
author Vas Crabb <vas@vastheman.com>2024-04-22 08:04:58 +1000
committer Vas Crabb <vas@vastheman.com>2024-04-22 08:04:58 +1000
commit184292b730f4236bd4840e780fdad97ee060ec84 (patch)
tree67902161a465fe92aec78ca502de07092b8cde0f /3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp
parent24154bc1f00790f344120b3a85175d6f616c5ad0 (diff)
3rdparty/asio: Updated to 1.30.2
Diffstat (limited to '3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp')
-rw-r--r--3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp53
1 files changed, 47 insertions, 6 deletions
diff --git a/3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp b/3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp
index 879e38ca0db..808a179e2d3 100644
--- a/3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp
+++ b/3rdparty/asio/src/examples/cpp14/operations/composed_4.cpp
@@ -2,13 +2,14 @@
// composed_4.cpp
// ~~~~~~~~~~~~~~
//
-// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// 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/bind_executor.hpp>
+#include <asio/deferred.hpp>
#include <asio/io_context.hpp>
#include <asio/ip/tcp.hpp>
#include <asio/use_future.hpp>
@@ -38,12 +39,19 @@ template <typename CompletionToken>
auto async_write_message(tcp::socket& socket,
const char* message, CompletionToken&& token)
// The return type of the initiating function is deduced from the combination
- // of CompletionToken type and the completion handler's signature. When the
- // completion token is a simple callback, the return type is always void.
- // In this example, when the completion token is asio::yield_context
- // (used for stackful coroutines) the return type would be also be void, as
+ // of:
+ //
+ // - the CompletionToken type,
+ // - the completion handler signature, and
+ // - the asynchronous operation's initiation function object.
+ //
+ // When the completion token is a simple callback, the return type is always
+ // void. In this example, when the completion token is asio::yield_context
+ // (used for stackful coroutines) the return type would also be void, as
// there is no non-error argument to the completion handler. When the
- // completion token is asio::use_future it would be std::future<void>.
+ // completion token is asio::use_future it would be std::future<void>. When
+ // the completion token is asio::deferred, the return type differs for each
+ // asynchronous operation.
//
// In C++14 we can omit the return type as it is automatically deduced from
// the return type of asio::async_initiate.
@@ -165,6 +173,38 @@ void test_callback()
//------------------------------------------------------------------------------
+void test_deferred()
+{
+ asio::io_context io_context;
+
+ tcp::acceptor acceptor(io_context, {tcp::v4(), 55555});
+ tcp::socket socket = acceptor.accept();
+
+ // Test our asynchronous operation using the deferred completion token. This
+ // token causes the operation's initiating function to package up the
+ // operation with its arguments to return a function object, which may then be
+ // used to launch the asynchronous operation.
+ auto op = async_write_message(socket, "", asio::deferred);
+
+ // Launch the operation using a lambda as a callback.
+ std::move(op)(
+ [](const std::error_code& error)
+ {
+ if (!error)
+ {
+ std::cout << "Message sent\n";
+ }
+ else
+ {
+ std::cout << "Error: " << error.message() << "\n";
+ }
+ });
+
+ io_context.run();
+}
+
+//------------------------------------------------------------------------------
+
void test_future()
{
asio::io_context io_context;
@@ -197,5 +237,6 @@ void test_future()
int main()
{
test_callback();
+ test_deferred();
test_future();
}