exercise8.cpp

#include "city.h"
#include "country.h"
#include "world-util.h"

#include <map>
#include <iostream>
#include <string>
#include <memory>
#include <ranges>
#include <parallel/numeric>
#include <functional>

using namespace std;
using namespace world;

map<int,shared_ptr<city>> cities;
map<string,shared_ptr<country>> countries;
auto
in_continent(shared_ptr<country>& ulke, const string& continent){
    return ulke->continent == continent;
}

auto
string_length_shorter(const string& s,int length_limit){
    return s.size() <= length_limit;
}

auto
to_country_name(shared_ptr<country>& ulke){
    return ulke->name;
}

int main(){
    create_world();
    auto is_asian = bind(in_continent, placeholders::_1, "Asia");
    auto length_shorter_than4 = bind(string_length_shorter,placeholders::_1,4);
    // "Asia" kıtasındaki 4 ya da daha az karakterden oluşan ülke isimleri
    for (auto country_name :
            ranges::views::values(countries)
         |  ranges::views::filter(is_asian)
         |  ranges::views::transform(to_country_name)
         |  ranges::views::filter(length_shorter_than4)
    ){
        cout << country_name << endl;
    }
    auto to_country = [](pair<const string,shared_ptr<country>>& entry){
        return entry.second;
    };
    vector<shared_ptr<country>> v_countries;
    // ranges::views::values(countries)
    transform(countries.begin(),countries.end(), back_inserter(v_countries),to_country);

    // ranges::views::filter(is_asian)
    vector<shared_ptr<country>> asian_countries;
    copy_if(v_countries.begin(),v_countries.end(), back_inserter(asian_countries),is_asian);

    // ranges::views::transform(to_country_name)
    vector<string> asian_countries_names;
    transform(asian_countries.begin(),asian_countries.end(), back_inserter(asian_countries_names), to_country_name);

    // ranges::views::filter(length_shorter_than4)
    vector<string> asian_countries_names_shorter_than4;
    copy_if(asian_countries_names.begin(),asian_countries_names.end(), back_inserter(asian_countries_names_shorter_than4),length_shorter_than4);

    // for (auto country_name :
    for_each(asian_countries_names_shorter_than4.begin(),asian_countries_names_shorter_than4.end(),[](auto s){cout << s << endl;}) ;
    return 0;
}