bool City::operator <(const City &_city)const{
if(m_name < _city.name())
return true;
if (m_name>_city.name())
return false;
if (m_country_id < _city.country_id())
return true;
if (m_country_id>_city.country_id())
return false;
if (GeoGraphyUtils::less_than(longitude(), _city.longitude()))
return true;
if (GeoGraphyUtils::greater_than(longitude(), _city.longitude()))
return false;
if (GeoGraphyUtils::less_than(latitude(), _city.latitude()))
return true;
if (GeoGraphyUtils::greater_than(latitude(), _city.latitude()))
return false;
return false;
}
std::string Cities::country_name(const City &_city)const{
return m_countries.find_by_id(_city.country_id()).name();
}