I apologize in advance for not being able to bring a complete review due to my lack of knowledge of the problem domain, but I hope to bring a few elements. I also apologize in advance for the unfair treatment to Luke that I was not able to do the same about Polygon due to my lack of time at the point of the Polygon review. *What is your evaluation of the design? The design looks clear enough so that I was able to understand about what was being done. Adding concept checking is a good idea. It also surely is a modern generic design. I found only 2 points to criticize: - linestring has std::vector as basis class, and therefore it should be clearly documented that this class is not made to be derived from. - most or all of geometries classes have no virtual destructor and thus this should be clearly documented or changed. Better even would be to give the user choice through a policy. *What is your evaluation of the implementation? The code is clean and nice to read and I found it pretty easy to understand (apart from the deep geometry stuff of course). *What is your evaluation of the documentation? The examples are nice to read, the rest of the doc is a bit light and would probably not let me do more complicated stuff. I'd love an example about every feature. *What is your evaluation of the potential usefulness of the library? For me quite big. I'd probably never need the advanced features but the simple ones would solve my biggest problem, which is how to avoid ever having to implement something like this myself, which I would probably never manage anyway. About the completeness of the library, I am not able to judge it and trust the more experienced reviewers. *Did you try to use the library? With what compiler? Did you have any problems? I compiled several examples with VC9 + VC10 beta2. Both compiled without warnings level 3. The VC10 code analyser found a few points (reported to one the library writers), which I suppose are minor. Interestingly, the analyser did not find a bug in the linestring example, which happens only with VC10. This bug needs fixing but must be pretty simple to correct. *How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? I spent a few hours reading and running the examples and checking the analyser and compiler level 4 warnings. I also spent 2 hours looking at the code. *Are you knowledgeable about the problem domain? Not at all. I'm simply looking for a library in case I ever need to do something in this domain. *Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. YES, eventhough I wouldn't count my own opinion as a full vote due to my lack of domain expertise. I like: - some nice features I understood like the linestring and polygon - the fact that the code is clean (meaning lots of care has been spent on it) and that the authors are responsive, which is a sign that the library will be well-maintained. - the examples I like less: - the documentation which gave me the frustrating feeling I missed most of the cool stuff and needs some warning messages for the problems I cited above. Best regards, Christophe Henry