I've been reviewing this library, and wow, it is brilliant. The APIs provide excellent functionality with a sensible and modern design. Congratulations, this is very well done.
The only problem for me is the lack of support for wide characters, and unfortunately, it's a deal breaker. My app deals in wide characters, and I can't take on the cost of constantly converting my strings between w and a. I've read the rationale for this, and there must be something missing because I just don't understand it. Boost, which is otherwise inferior to POCO as far as I'm concerned, has wstring support. Why can't POCO?