asio::buffered_stream and family missing future returns

[vinnie.falco@…]

I'm practically a novice but it seems that asio::buffered_read_stream and asio::buffered_write_stream async operations are missing the futures return value. I believe that asio::buffered_read_stream::async_read_some should have a function signature that looks like this:

  template <typename MutableBufferSequence, typename ReadHandler>
  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,
      void (boost::system::error_code, std::size_t))
  async_read_some(const MutableBufferSequence& buffers,
      BOOST_ASIO_MOVE_ARG(ReadHandler) handler)

I marked this as "Problem" because it is not possible to wrap either of these objects in such a way that they are fully compatible with future returns.

Note that classes like asio::basic_stream_socket all provide futures return values for async functions (when supported by the build configuration).

If I am incorrect please advise me so I can correct my own code because this is the model I am following

[anonymous]

It seems this is not a "std::future" return but more, a specialization of asio::async_result<> that allows a handler to produce a return value from an initiating function.

If user-defined handlers are going to be able to perfectly wrap boost::asio objects then they need ways of returning the async_result without relying on classes in a detail namespace.

[chris_kohlhoff]

Fixed on trunk in [85798]. Merged to release in [85838]. See also #9000.