Function check

test/ldsb.cpp:101–136

   */
  template <class T, class VarArgsType>
  bool
  check(DFS<T>& e, std::vector<VarArgsType> expected) {
    int nexpected = expected.size();
    for (int i = 0 ; i < nexpected ; ++i) {
      T* s = e.next();
      if (s == nullptr) {
        if (opt.log) {
          olog << "Expected a solution but there are no more solutions." << std::endl;
          olog << "(Expected " << nexpected << " but only found " << i << ")" << std::endl;
          olog << "Expected: " << expected[i] << std::endl;
        }
        return false;
      }
      if (!equal(s->solution(), expected[i])) {
        if (opt.log) {
          olog << "Solution does not match expected." << std::endl;
          olog << "Solution: " << s->solution() << std::endl;
          olog << "Expected: " << expected[i] << std::endl;
        }
        return false;
      }
      delete s;
    }
    T* s = e.next();
    if (s != nullptr) {
      if (opt.log) {
        olog << "More solutions than expected:" << std::endl;
        olog << "(Expected only " << nexpected << ")" << std::endl;
        olog << s->solution() << std::endl;
      }
      return false;
    }

    // Nothing went wrong.
    return true;
  }


  /// %Test space