update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / asio / example / cpp14 / deferred / deferred_7.cpp

diff --git a/ceph/src/boost/libs/asio/example/cpp14/deferred/deferred_7.cpp b/ceph/src/boost/libs/asio/example/cpp14/deferred/deferred_7.cpp
new file mode 100644 (file)
index 0000000..0caaa77
--- /dev/null
+++ b/ceph/src/boost/libs/asio/example/cpp14/deferred/deferred_7.cpp
@@ -0,0 +1,73 @@
+//
+// deferred_7.cpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2022 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 <boost/asio.hpp>
+#include <boost/asio/experimental/append.hpp>
+#include <boost/asio/experimental/deferred.hpp>
+#include <iostream>
+
+using boost::asio::experimental::append;
+using boost::asio::experimental::deferred;
+
+template <typename CompletionToken>
+auto async_wait_twice(boost::asio::steady_timer& timer, CompletionToken&& token)
+{
+  return deferred.values(&timer)
+    | deferred(
+        [](boost::asio::steady_timer* timer)
+        {
+          timer->expires_after(std::chrono::seconds(1));
+          return timer->async_wait(append(deferred, timer));
+        }
+      )
+    | deferred(
+        [](boost::system::error_code ec, boost::asio::steady_timer* timer)
+        {
+          std::cout << "first timer wait finished: " << ec.message() << "\n";
+          timer->expires_after(std::chrono::seconds(1));
+          return deferred.when(!ec)
+            .then(timer->async_wait(deferred))
+            .otherwise(deferred.values(ec));
+        }
+      )
+    | deferred(
+        [](boost::system::error_code ec)
+        {
+          std::cout << "second timer wait finished: " << ec.message() << "\n";
+          return deferred.when(!ec)
+            .then(deferred.values(42))
+            .otherwise(deferred.values(0));
+        }
+      )
+    | std::forward<CompletionToken>(token);
+}
+
+int main()
+{
+  boost::asio::io_context ctx;
+
+  boost::asio::steady_timer timer(ctx);
+  timer.expires_after(std::chrono::seconds(1));
+
+  async_wait_twice(
+      timer,
+      [](int result)
+      {
+        std::cout << "result is " << result << "\n";
+      }
+    );
+
+  // Uncomment the following line to trigger an error in async_wait_twice.
+  //timer.cancel();
+
+  ctx.run();
+
+  return 0;
+}