From a8db5f39dd126cb66d4f689db359a7963d9172b2 Mon Sep 17 00:00:00 2001
From: "Ivan A. Melnikov" <iv@altlinux.org>
Date: Tue, 5 Nov 2024 12:35:08 +0400
Subject: [PATCH] co_composed.hpp: Guard use of async_operation

`async_operation` is defined only when concepts are in use.
When ASIO_DISABLE_CONCEPTS is defined, bare `typename`
should be used instead.

We can't use ASIO_ASYNC_OPERATION macros here, as it currently
does not have a no-argument form.

Fixes: #1547
---
 asio/include/asio/co_composed.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/asio/include/asio/co_composed.hpp b/asio/include/asio/co_composed.hpp
index 01fe29829a..f0bc98e8cc 100644
--- a/asio/include/asio/co_composed.hpp
+++ b/asio/include/asio/co_composed.hpp
@@ -845,7 +845,11 @@ class co_composed_promise
     throw;
   }
 
+#ifdef ASIO_DISABLE_CONCEPTS
+  template <typename Op>
+#else
   template <async_operation Op>
+#endif
   auto await_transform(Op&& op
 #if defined(ASIO_ENABLE_HANDLER_TRACKING)
 # if defined(ASIO_HAS_SOURCE_LOCATION)