Andrew Schweitzer wrote:
Andrew Schweitzer wrote:
5) demuxer_service creates a platform-implementation demuxer_service (right?)
Rene Rivera wrote:
Not as far as I know. This is one of the points that some people have contention with. The real relation between demuxer_service and the implementation is closer to a PIMPL idiom, but without the pointer. In other words it's equivalent to:
demuxer_service *is-a* detail::win_iocp_demuxer_service
[snip]
I think I'm confused. As far as I can tell, there's no inheritance relationship between demuxer_service and win_iocp_demuxer_service, but as you said, it's a PIMPL relation, or perhaps an RIMPL relation since it's a reference not a pointer.
We can consider the reference as just a different kind of pointer in this case. After all it could just as easily be a pointer and the forwarding functions would deref the pointer, instead of the compiler doing the deref for you.
Is PIMPL considered is-a or has-a?
I've always considered it an is-a. A very special case, but equivalent.
I think the library design or naming might be a bit confused on this point (or quite possibly it's me).
The fact that it's confusing, even when looking at the code, is a point against the design ;-) OK, I'm rereading the code, instead of relying on memory...
As far as I can tell two things are true: 1) the demuxer ends up with two actual services in its list after it is constructed: a) demuxer_service b) win_iocp_demuxer_service (or the selected platform-implemenation of demuxer_service)
OK, AFAICT it only ends up with (b) in the service_registry.
2) the demuxer also has a PIMPL relation with demuxer_service, and demuxer_service has a PIMPL relation with win_iocp_demuxer_service
Yes. I guess the key point here is that there's only 1 (singleton) of win_iocp_demuxer_service for all demuxer_service instances in the same basic_demuxer instance? (again AFAICT)
Are you reading the code differently? I might have gotten lost.
I guess, I'm reading it differently :-) -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - Grafik/jabber.org