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          The boost::asio::use_future special value provides first-class
          support for returning a C++11 std::future from an asynchronous
          operation's initiating function.
        
          To use boost::asio::use_future, pass it to an asynchronous
          operation instead of a normal completion handler. For example:
        
std::future<std::size_t> length = my_socket.async_read_some(my_buffer, boost::asio::use_future);
Where a handler signature has the form:
void handler(boost::system::error_code ec, result_type result);
          the initiating function returns a std::future templated on
          result_type. In the above example, this is std::size_t.
          If the asynchronous operation fails, the error_code is converted
          into a system_error exception and passed back to the caller
          through the future.
        
Where a handler signature has the form:
void handler(boost::system::error_code ec);
          the initiating function returns std::future<void>. As
          above, an error is passed back in the future as a system_error
          exception.