Fix async_handshake compatibility with default completion tokens.

kassane · Dec 5, 2023 · 75aabc1 · 75aabc1
1 parent 23b6a4b
commit 75aabc1
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/asio/include/asio/ssl/stream.hpp b/asio/include/asio/ssl/stream.hpp
@@ -18,6 +18,7 @@
 #include "asio/detail/config.hpp"
 
 #include "asio/async_result.hpp"
+#include "asio/buffer.hpp"
 #include "asio/detail/buffer_sequence_adapter.hpp"
 #include "asio/detail/handler_type_requirements.hpp"
 #include "asio/detail/non_const_lvalue.hpp"
@@ -559,7 +560,10 @@ class stream :
           = default_completion_token_t<executor_type>>
   auto async_handshake(handshake_type type, const ConstBufferSequence& buffers,
       BufferedHandshakeToken&& token
-        = default_completion_token_t<executor_type>())
+        = default_completion_token_t<executor_type>(),
+      constraint_t<
+        is_const_buffer_sequence<ConstBufferSequence>::value
+      > = 0)
     -> decltype(
       async_initiate<BufferedHandshakeToken,
         void (asio::error_code, std::size_t)>(