C++ (Cpp) DataSource::ReadFeatures示例

bool MatchResults(DataSource const & dataSource, vector<shared_ptr<MatchingRule>> rules,
                  vector<search::Result> const & actual)
{
  vector<FeatureID> resultIds;
  for (auto const & a : actual)
    resultIds.push_back(a.GetFeatureID());
  sort(resultIds.begin(), resultIds.end());

  vector<string> unexpected;
  auto removeMatched = [&rules, &unexpected](FeatureType & feature) {
    for (auto it = rules.begin(); it != rules.end(); ++it)
    {
      if ((*it)->Matches(feature))
      {
        rules.erase(it);
        return;
      }
    }
    unexpected.push_back(feature.DebugString(FeatureType::BEST_GEOMETRY) + " from " +
                         DebugPrint(feature.GetID().m_mwmId));
  };
  dataSource.ReadFeatures(removeMatched, resultIds);

  if (rules.empty() && unexpected.empty())
    return true;

  ostringstream os;
  os << "Unsatisfied rules:" << endl;
  for (auto const & e : rules)
    os << "  " << DebugPrint(*e) << endl;
  os << "Unexpected retrieved features:" << endl;
  for (auto const & u : unexpected)
    os << "  " << u << endl;

  LOG(LWARNING, (os.str()));
  return false;
}