On 10/23/07, Douglas Gregor <dgregor@osl.iu.edu> wrote:
Stjepan Rajko wrote:
For my specializable functions, I adapted what is used in fusion, e.g.:
[snip]
IIRC, using this form makes operation_impl<some_producer_tag, some_consumer_tag> into an MPL metafunction class, which makes it usable with all of the various metafunction algorithms. That's important if you need to use MPL algorithms across sequences of producer/consumer types.
Ahh, I see. I had no idea where this convention came from :-) I'll have to think about how useful direct MPL interoperability is in the dataflow lib...
[snip]
, or the technique described in: http://www.boost.org/more/generic_programming.html,
or any other tag dispatching convention I should be aware of?
I still prefer the technique described at the web page you mention, because it's more robust with the evolution of the concepts in the library. For example, note in the advance() example there that we only [snip]
OK, I see... But then I suppose the tricky part becomes getting the exact result type, if it's not fixed... Doug, thank you very much for such a detailed response! Now I have some thinking to do :-) Stjepan