[boost] Passing strings as a template parameter (small utility)

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Now that I think about it some more, there's really nothing stopping us from taking this much farther -- access individual characters, calculate the length, slice and substr, even search and replace. There's no reason why ctstring<> can't implement most of the std::string interface at compile time.

This would be great showcase of the advanced work being done by boost developers. This would have a "high" wow factor. I bet, the vast horde of "old-style" c++ developers what immediately step up and take notice.