Hi, me again! :)
Marc Lehmann, el 14 de diciembre a las 20:10 me escribiste:
> The bigger problem you will face is that there are ten or so watcher types
> as opposed to only one.
I think I underestimated this issue =P
Is not that is a lot of work typing (that, as painful as it is, it's done
only once ;), but the lack of a base "class" to have a container of
watchers.
I thought about a lot of solutions, but all has their drawbacks:
* "Interfaces": a pure virtual base class with the basic operations
(start(), stop() mainly) and multiple inheritance for each watcher
(like struct io: ev_io, base { ... };). The obvious problem here
is the objects are not POD anymore, so you can't pass a io object
directly to ev_io_xxx() functions. Discarded.
* Wrappers: instead of inheriting directly from ev_xxx watcher, make a
wrapper, like struct base { void* w; }, but again, start() and stop()
would have to be virtual, because each watcher type has it own
ev_xxx_start() and stop() functions. This time at least is doable
because I have my POD watcher w to pass to the libev functions, but
implies an extra pointer per watcher and the extra indirection in the
start()/stop() calls because of the virtualness, but this can't be
avoided by nature if I want a common base class.
Another approach to this would be to store a pointer to a start() and
stop() functions, but that would take some extra space, since I have to
store all the function pointers, which looks stupid =)
* I probably thought about other "broken" solution that I can't remember
now =P
So the question is, what is worst? To don't have support to put any kind
of watcher into the same container, or the extra space/complexity? Does
anyone have a better solution?
--
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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