awaitable.hpp in passenger-6.0.15

- old
+ new

@@ -1,10 +1,10 @@
 //
 // awaitable.hpp
 // ~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// 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)
 //
 
@@ -23,10 +23,11 @@
 # include <coroutine>
 #else // defined(BOOST_ASIO_HAS_STD_COROUTINE)
 # include <experimental/coroutine>
 #endif // defined(BOOST_ASIO_HAS_STD_COROUTINE)
 
+#include <utility>
 #include <boost/asio/any_io_executor.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
@@ -72,9 +73,17 @@
   /// Destructor
   ~awaitable()
   {
     if (frame_)
       frame_->destroy();
+  }
+
+  /// Move assignment.
+  awaitable& operator=(awaitable&& other) noexcept
+  {
+    if (this != &other)
+      frame_ = std::exchange(other.frame_, nullptr);
+    return *this;
   }
 
   /// Checks if the awaitable refers to a future result.
   bool valid() const noexcept
   {