1 // Copyright 2018 James E. King III. Use, modification and 2 // distribution is subject to the Boost Software License, Version 3 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at 4 // http://www.boost.org/LICENSE_1_0.txt) 5 6 #include <boost/logic/tribool.hpp> 7 main(int,char * [])8int main(int, char*[]) 9 { 10 using boost::logic::indeterminate; 11 using boost::logic::tribool; 12 13 tribool i(indeterminate); 14 15 return i << 1; // expect to see: error: invalid operands to binary expression ('boost::logic::tribool' and 'int') 16 } 17