void test_symmetry(const Symmetry& s) {
std::map<int, Symmetry::const_iterator> m;
for (Symmetry::const_iterator i = s.begin(); i != s.end(); ++i) {
for (unsigned int j = 0; j < 81; ++j) {
if ((*i)[j]) {
std::pair<std::map<int, Symmetry::const_iterator>::iterator, bool> result
= m.insert(std::make_pair(j, i));
assert(result.second);
}
}
}
for (unsigned int j = 0; j < 81; ++j) {
std::map<int, Symmetry::const_iterator>::iterator it = m.find(j);
assert(it != m.end());
}
}
