Hi, I would like to start with resolution. I vote NOT to accept this submission. Here some more details:

1. What is your evaluation of the design?

Library trying to solve in fact trivial problem. Would it be presented as trivial function Template<typename C> Foo( C const& c, std::string open, std::string close, std::string sep ); I may understand it. As to presented design - I see it as unnecessary complicated. And in many cases simply incorrect. Library does not follow standard practice as to wide char support. Interfaces seem confusing and error prone. Decoration model seems too simple to warrant so much trouble as reusable library. Maybe more powerful/flexible solution should be considered.

2. What is your evaluation of the implementation?

In most part I either don't understand or don't like it. IMO simple task library trying to solve shouldn't require that much code. Simple overloading base solution should've done the trick.

3. What is your evaluation of the documentation?

Did not get to this stage.

4. What is your evaluation of the potential usefulness of the library?

Now to the most important: why would I ever want to use library like this? We have already: std::ostream boost::format boost::serailization In what scenario I would use this library? I most definitely wouldn't want to repeat all this formatting every time I need to output my vector. If I write output operation rarely - I would use explicit loop -it's more flexible anyway. If I write output operation frequently - I would separate in function and here again would use explicit loop for the same reasons. If I write many output functions like above - I would write wrapper function like in 1. And it will work for most collections. I wouldn't use this library for filtering - we will have iostreams library for that (If I am not mistaken). I wouldn't use this library for XML printing - why would I want to mention tag name twice? Anybody?

5. Did you try to use the library?

Did not get to this stage.

6. How much effort did you put into your evaluation?

A quick In-depth study.

7. Are you knowledgeable about the problem domain?

That's the main issue - I do not see problem domain. Regards, Gennadiy.