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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// SPDX-FileCopyrightText: 2020 - 2025 Kohei Yoshida
//
// SPDX-License-Identifier: MIT
#include <iostream>
#include <vector>
#include <fstream>
#include <mdds/trie_map.hpp>
int main() try
{
//!code-start: type
using map_type = mdds::packed_trie_map<std::string, int>;
//!code-end: type
// List of world's largest cities and their populations. The entries must
// be sorted by the keys.
//
// c.f. https://en.wikipedia.org/wiki/List_of_largest_cities#cities
//!code-start: entries
std::vector<map_type::entry> entries =
{
{ MDDS_ASCII("Ahmedabad"), 7681000 },
{ MDDS_ASCII("Alexandria"), 5086000 },
{ MDDS_ASCII("Atlanta"), 5572000 },
{ MDDS_ASCII("Baghdad"), 6812000 },
{ MDDS_ASCII("Bangalore"), 11440000 },
{ MDDS_ASCII("Bangkok"), 10156000 },
{ MDDS_ASCII("Barcelona"), 5494000 },
{ MDDS_ASCII("Beijing"), 19618000 },
{ MDDS_ASCII("Belo Horizonte"), 5972000 },
{ MDDS_ASCII("Bogota"), 10574000 },
{ MDDS_ASCII("Buenos Aires"), 14967000 },
{ MDDS_ASCII("Cairo"), 20076000 },
{ MDDS_ASCII("Chengdu"), 8813000 },
{ MDDS_ASCII("Chennai"), 10456000 },
{ MDDS_ASCII("Chicago"), 8864000 },
{ MDDS_ASCII("Chongqing"), 14838000 },
{ MDDS_ASCII("Dalian"), 5300000 },
{ MDDS_ASCII("Dallas"), 6099000 },
{ MDDS_ASCII("Dar es Salaam"), 6048000 },
{ MDDS_ASCII("Delhi"), 28514000 },
{ MDDS_ASCII("Dhaka"), 19578000 },
{ MDDS_ASCII("Dongguan"), 7360000 },
{ MDDS_ASCII("Foshan"), 7236000 },
{ MDDS_ASCII("Fukuoka"), 5551000 },
{ MDDS_ASCII("Guadalajara"), 5023000 },
{ MDDS_ASCII("Guangzhou"), 12638000 },
{ MDDS_ASCII("Hangzhou"), 7236000 },
{ MDDS_ASCII("Harbin"), 6115000 },
{ MDDS_ASCII("Ho Chi Minh City"), 8145000 },
{ MDDS_ASCII("Hong Kong"), 7429000 },
{ MDDS_ASCII("Houston"), 6115000 },
{ MDDS_ASCII("Hyderabad"), 9482000 },
{ MDDS_ASCII("Istanbul"), 14751000 },
{ MDDS_ASCII("Jakarta"), 10517000 },
{ MDDS_ASCII("Jinan"), 5052000 },
{ MDDS_ASCII("Johannesburg"), 5486000 },
{ MDDS_ASCII("Karachi"), 15400000 },
{ MDDS_ASCII("Khartoum"), 5534000 },
{ MDDS_ASCII("Kinshasa"), 13171000 },
{ MDDS_ASCII("Kolkata"), 14681000 },
{ MDDS_ASCII("Kuala Lumpur"), 7564000 },
{ MDDS_ASCII("Lagos"), 13463000 },
{ MDDS_ASCII("Lahore"), 11738000 },
{ MDDS_ASCII("Lima"), 10391000 },
{ MDDS_ASCII("London"), 9046000 },
{ MDDS_ASCII("Los Angeles"), 12458000 },
{ MDDS_ASCII("Luanda"), 7774000 },
{ MDDS_ASCII("Madrid"), 6497000 },
{ MDDS_ASCII("Manila"), 13482000 },
{ MDDS_ASCII("Mexico City"), 21581000 },
{ MDDS_ASCII("Miami"), 6036000 },
{ MDDS_ASCII("Moscow"), 12410000 },
{ MDDS_ASCII("Mumbai"), 19980000 },
{ MDDS_ASCII("Nagoya"), 9507000 },
{ MDDS_ASCII("Nanjing"), 8245000 },
{ MDDS_ASCII("New York City"), 18819000 },
{ MDDS_ASCII("Osaka"), 19281000 },
{ MDDS_ASCII("Paris"), 10901000 },
{ MDDS_ASCII("Philadelphia"), 5695000 },
{ MDDS_ASCII("Pune"), 6276000 },
{ MDDS_ASCII("Qingdao"), 5381000 },
{ MDDS_ASCII("Rio de Janeiro"), 13293000 },
{ MDDS_ASCII("Riyadh"), 6907000 },
{ MDDS_ASCII("Saint Petersburg"), 5383000 },
{ MDDS_ASCII("Santiago"), 6680000 },
{ MDDS_ASCII("Sao Paulo"), 21650000 },
{ MDDS_ASCII("Seoul"), 9963000 },
{ MDDS_ASCII("Shanghai"), 25582000 },
{ MDDS_ASCII("Shenyang"), 6921000 },
{ MDDS_ASCII("Shenzhen"), 11908000 },
{ MDDS_ASCII("Singapore"), 5792000 },
{ MDDS_ASCII("Surat"), 6564000 },
{ MDDS_ASCII("Suzhou"), 6339000 },
{ MDDS_ASCII("Tehran"), 8896000 },
{ MDDS_ASCII("Tianjin"), 13215000 },
{ MDDS_ASCII("Tokyo"), 37400068 },
{ MDDS_ASCII("Toronto"), 6082000 },
{ MDDS_ASCII("Washington, D.C."), 5207000 },
{ MDDS_ASCII("Wuhan"), 8176000 },
{ MDDS_ASCII("Xi'an"), 7444000 },
{ MDDS_ASCII("Yangon"), 5157000 },
};
//!code-end: entries
//!code-start: inst
map_type cities(entries.data(), entries.size());
//!code-end: inst
//!code-start: print-n-cities
std::cout << "Number of cities: " << cities.size() << std::endl;
//!code-end: print-n-cities
std::cout << std::endl;
{
//!code-start: search-s
std::cout << "Cities that begin with 'S':" << std::endl;
auto results = cities.prefix_search("S");
for (const auto& city : results)
std::cout << " * " << city.first << ": " << city.second << std::endl;
//!code-end: search-s
}
std::cout << std::endl;
{
//!code-start: save-state-cities
std::ofstream outfile("cities.bin", std::ios::binary);
cities.save_state(outfile);
//!code-end: save-state-cities
}
//!code-start: load-state-cities
map_type cities_loaded;
std::ifstream infile("cities.bin", std::ios::binary);
cities_loaded.load_state(infile);
//!code-end: load-state-cities
std::ios_base::fmtflags origflags = std::cout.flags();
//!code-start: check-equal
std::cout << "Equal to the original? " << std::boolalpha << (cities == cities_loaded) << std::endl;
//!code-end: check-equal
std::cout.setf(origflags);
std::cout << std::endl;
//!code-start: print-n-cities-2
std::cout << "Number of cities: " << cities_loaded.size() << std::endl;
//!code-end: print-n-cities-2
std::cout << std::endl;
//!code-start: search-s-2
std::cout << "Cities that begin with 'S':" << std::endl;
auto results = cities_loaded.prefix_search("S");
for (const auto& city : results)
std::cout << " * " << city.first << ": " << city.second << std::endl;
//!code-end: search-s-2
return EXIT_SUCCESS;
}
catch (...)
{
return EXIT_FAILURE;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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