Please state clearly whether you think this library should be accepted as a Boost library.
Yes. Absolutely.
1. What is your evaluation of the design?
Library design is clean. Using MPL for defining concepts is a good choice.
2. What is your evaluation of the implementation?
Haven't look in details.
3. What is your evaluation of the documentation?
Documentation isn't bad, but i would like to have more mini real-world examples for each section (i.e. Functions with multiple arguments, References, ...).
4. What is your evaluation of the potential usefulness of the library?
For me, it has a great potential. Now, I know exactly two places where I could use it in my project.
5. Did you try to use the library? With what compiler? Did you have any problems?
No, haven't tried. Only look at examples.
6. How much effort did you put into your evaluation? A glance? A quick reading? In-depth study?
3 - 4 hours.
7. Are you knowledgeable about the problem domain?
I'm not an expert, but I'm using boost::any with minor custom modification and own visitation framework. Also have used boost ranges' any_iterator. Thank you, Trigve