From badd16b2ffc8756857829139769709bfdbf4792a Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Mon, 27 Jul 2020 09:33:49 +1000
Subject: [PATCH] Fix detection of standard executors as I/O executors in
 async_compose.

---
 include/boost/asio/impl/compose.hpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/boost/asio/impl/compose.hpp b/include/boost/asio/impl/compose.hpp
index e7b74952..fc8f6757 100644
--- a/include/boost/asio/impl/compose.hpp
+++ b/include/boost/asio/impl/compose.hpp
@@ -496,14 +496,20 @@ namespace detail
   template <typename IoObject>
   inline typename IoObject::executor_type
   get_composed_io_executor(IoObject& io_object,
-      typename enable_if<!is_executor<IoObject>::value>::type* = 0)
+      typename enable_if<
+        !is_executor<IoObject>::value
+          && !execution::is_executor<IoObject>::value
+      >::type* = 0)
   {
     return io_object.get_executor();
   }
 
   template <typename Executor>
   inline const Executor& get_composed_io_executor(const Executor& ex,
-      typename enable_if<is_executor<Executor>::value>::type* = 0)
+      typename enable_if<
+        is_executor<Executor>::value
+          || execution::is_executor<Executor>::value
+      >::type* = 0)
   {
     return ex;
   }