David Abrahams wrote:
on Tue Jul 15 2008, Joel de Guzman <joel-AT-boost-consulting.com> wrote:
Stjepan Rajko wrote:
How about hacking on the /lazy_sequence/ idea? Thoughts?
I *love it*. Attached is something... similar ;-) (I used the triple.cpp example as a starting point, it was pretty straightforward)
What do you think? I Love it! I think this should be an official part of Fusion. There are some matters though that we should consider very well:
1) The concept of an infinite-sequence.
I'm not quite happy that all sequences has a finite size.
Where does that restriction come from? You know you can always give infinite sequences an (unreachable) end iterator.
Here: http://tinyurl.com/4b9m8q The size(s), result_of::size<S> gives this restriction. The result should be "MPL Integral Constant. Convertible to int.". This is inherited from MPL: http://tinyurl.com/6cbx9c IMO, and we've been discussing this with Tobias and Dan offlist, both MPL and Fusion should have a more relaxed concept for infinite sequences without the "size" requirement. Or... At the very least, both MPL and Fusion forward sequences should relax the result type of size to allow a special "inf", "positive_inf" and "negative_inf" types, in addition to "Integral Constant". Regards, -- Joel de Guzman http://www.boostpro.com http://spirit.sf.net