[boost] Hana Views and References

Subject: [boost] Hana Views and References
From: Joel de Guzman (djowel_at_[hidden])
Date: 2015-06-23 17:36:04

Hello Louis,

Mario Lang, a Spirit developer, played around with Hana and
investigated on it's suitability for Spirit. His conclusion
is that "Hana is really quite nice!". Then, he adds that:
"However, Hana lacks a way to retrieve the members of a
struct as references currently, which will pretty much kill
a Hana based Spirit effort."

So the question is: will Hana support references without
resorting to using reference wrappers? I do appreciate
the FP nature of Hana, but please be reminded that we're
in C++.

I also recall some discussion that Hana also does not support
Fusion-like lightweight views. Is there a plan to support them?

I haven't fully investigated yet what else Hana does not support
that Fusion does, but at least these two important aspects of
fusion come to mind. At the very least, I don't think Hana should
advertize itself as a superset of Boost.Fusion. Faster runtime
performance is also questionable, when lightweight views and
reference members come into play.

Regards,
-- 
Joel de Guzman
http://www.ciere.com
http://boost-spirit.com
http://www.cycfi.com/