Logic, part of collection of the Boost C++ Libraries, provides boost::logic::tribool for 3-state boolean logic.
Distributed under the Boost Software License, Version 1.0.
- C++03
 - Header Only
 
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- Ask questions
 - Report bugs: Be sure to mention Boost version, platform and compiler you're using. A small compilable code sample to reproduce the problem is always good as well.
 - Submit your patches as pull requests against develop branch. Note that by submitting patches you agree to license your modifications under the Boost Software License, Version 1.0.
 - Discussions about the library are held on the Boost developers mailing list. Be sure to read the discussion policy before posting and add the 
[logic]tag at the beginning of the subject line.