Cherno Map Basics

#include <map>
#include <unordered_map>
#include <iostream>

struct CityRecord
{
    std::string Name;
    uint64_t Population;
    double Latitude, Longitude;
};

int main()
{
    std::vector<CityRecord> cities;

    cities.emplace_back("Melbourne", 5000000, 2.4, 9.4);
    cities.emplace_back("Lol-town", 5000000, 2.4, 9.4);
    cities.emplace_back("Paris", 5000000, 2.4, 9.4);
    cities.emplace_back("Berlin", 5000000, 2.4, 9.4);
    cities.emplace_back("London", 5000000, 2.4, 9.4);

    // searching for each city is a pain since you go through whole vector
    for (const auto& city : cities)
    {
        if (city.Name == "Berlin")
        {
            city.Population;
            break;
        }
    }

    std::map<std::string, CityRecord> cityMap;
    cityMap["Melbourne"] = CityRecord{"Melbourne", 5000000, 2.4, 9.4};
    cityMap["Lol-town"] = CityRecord{ "Lol-town", 5000000, 2.4, 9.4 };
    cityMap["Paris"] = CityRecord{ "Paris", 5000000, 2.4, 9.4 };
    cityMap["Berlin"] = CityRecord{ "Berlin", 5000000, 2.4, 9.4 };
    cityMap["London"] = CityRecord{ "London", 5000000, 2.4, 9.4 };

    CityRecord& berlinData = cityMap["Berlin"];
    berlinData.Population;
}