On Tue, 05 Aug 2014 21:05:30 +0200, Szymon Gatner <szymon.gatner@gmail.com> wrote:

[...]Version from 2011 is single class and NOT an ASIO extension - there is no

deriving from basic_io_object or io_service::service. Hence my question:
what is the benefit of deriving from those classes and making your class an
ASIO extension vs 2011 version where io_service is just used "externally"
for synchronization purposes.

I think the short answer is that you shouldn't derive from basic_io_object or create your own service unless you have to. :)
[...]
 Today if you ever need to wait for events asynchronously, you can reuse windows::object_handle and can ignore the entire framework Boost.Asio set up for I/O objects.