Change async_compose example to use return type compatible with new a…

…sync_result form.
chriskohlhoff · Jul 31, 2022 · 879dab6 · 879dab6
1 parent 10251c3
commit 879dab6
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Showing 2 changed files with 10 additions and 6 deletions.
diff --git a/asio/include/asio/compose.hpp b/asio/include/asio/compose.hpp
@@ -658,9 +658,11 @@ struct associator<Associator,
  * auto async_echo(tcp::socket& socket,
  *     asio::mutable_buffer buffer,
  *     CompletionToken&& token) ->
- *   typename asio::async_result<
- *     typename std::decay<CompletionToken>::type,
- *       void(asio::error_code, std::size_t)>::return_type
+ *   decltype(
+ *     asio::async_compose<CompletionToken,
+ *       void(asio::error_code, std::size_t)>(
+ *         std::declval<async_echo_implementation>(),
+ *         token, socket))
  * {
  *   return asio::async_compose<CompletionToken,
  *     void(asio::error_code, std::size_t)>(

diff --git a/asio/src/doc/reference.qbk b/asio/src/doc/reference.qbk
@@ -3321,9 +3321,11 @@ The async\_compose function simplifies the implementation of composed asynchrono
    auto async_echo(tcp::socket& socket,
        asio::mutable_buffer buffer,
        CompletionToken&& token) ->
-     typename asio::async_result<
-       typename std::decay<CompletionToken>::type,
-         void(asio::error_code, std::size_t)>::return_type
+     decltype(
+       asio::async_compose<CompletionToken,
+         void(asio::error_code, std::size_t)>(
+           std::declval<async_echo_implementation>(),
+           token, socket))
    {
      return asio::async_compose<CompletionToken,
        void(asio::error_code, std::size_t)>(