Re: How to detect classes with a count_elements handler in userland?

Afternoon, A change in convention makes sense, and sounds much nicer than hacking anything to make it work. I do prefer this approach to yet-another-function. Is changing convention all we would do though, or would we raise a warning when handler is present and interface is not ? Cheers Joe On Thu, Nov 17, 2016 at 11:49 AM, Nikita Popov <nikita.ppv@gmail.com> wrote: > On Thu, Nov 17, 2016 at 8:30 AM, Joe Watkins <pthreads@pthreads.org> > wrote: > >> Morning, >> >> Just to chime in ... can you split the PR into the RFC, and the new thing >> please. >> >> Just another question on how we could make objects that have >> count_elements (which is in object handlers) implement an interface on the >> class entry (which is detached from handlers) ? >> > >> I'm sure it's doable, but it doesn't look very straight forward, some >> kind of hacking in instanceof maybe ... not sure ... >> > > I don't think this needs any magic. We simply implement the interface by > convention. Just like you are supposed to implement Traversable if you're > implementing get_iterator. Similarly you should implement Countable if > you're using count_elements. > > Nikita >