# include <cppad/utility/set_union.hpp>

bool set_union(void)
{     bool ok = true;

     // create empty sets
     std::set<size_t> left, right, result;

     // set left = {1, 2}
     left.insert(1);
     left.insert(2);

     // set right = {2, 3}
     right.insert(2);
     right.insert(3);

     // set result = {1, 2} U {2, 3}
     result = CppAD::set_union(left, right);

     // expected result
     size_t check_vec[] = {1, 2, 3};
     std::set<size_t> check_set(check_vec, check_vec + 3);

     // check result
     ok &= result == check_set;

     return ok;
}