Does C++11 or C++14 support three or multiple valued logic?

Question

I am wondering if C++11 or C++14 supports three or multiple valued logic. If not, any existing library does it?

Answer 1

Boost tribool provides an interface for three-state logic. It doesn't require c++11 or c++1y.

http://www.boost.org/doc/libs/1_55_0/doc/html/tribool.html