Function GetAffiliations

generator/affiliation.cpp:79–105

// An implementation for CountriesFilesAffiliation class.
template <typename T>
std::vector<std::string> GetAffiliations(T const & t, borders::CountryPolygonsCollection const & countryPolygonsTree,
                                         bool haveBordersForWholeWorld)
{
  std::vector<std::string> countries;
  std::vector<std::reference_wrapper<borders::CountryPolygons const>> countriesContainer;
  countryPolygonsTree.ForEachCountryInRect(
      GetLimitRect(t), [&](auto const & countryPolygons) { countriesContainer.emplace_back(countryPolygons); });

  // todo(m.andrianov): We need to explore this optimization better. There is a hypothesis: some
  // elements belong to a rectangle, but do not belong to the exact boundary.
  if (haveBordersForWholeWorld && countriesContainer.size() == 1)
  {
    borders::CountryPolygons const & countryPolygons = countriesContainer.front();
    countries.emplace_back(countryPolygons.GetName());
    return countries;
  }

  for (borders::CountryPolygons const & countryPolygons : countriesContainer)
  {
    auto const need = ForAnyPoint(t, [&](auto const & point) { return countryPolygons.Contains(point); });

    if (need)
      countries.emplace_back(countryPolygons.GetName());
  }

  return countries;
}

// An implementation for CountriesFilesIndexAffiliation class.
using IndexSharedPtr = std::shared_ptr<CountriesFilesIndexAffiliation::Tree>;