Method async_write_some

test/write.cpp:115–123

  template <typename Const_Buffers, typename Handler>
  void async_write_some(const Const_Buffers& buffers,
      Handler&& handler)
  {
    size_t bytes_transferred = write_some(buffers);
    boost::asio::post(get_executor(),
        boost::asio::detail::bind_handler(
          static_cast<Handler&&>(handler),
          boost::system::error_code(), bytes_transferred));
  }

private:
  boost::asio::io_context& io_context_;