#include <cstdlib>
#include <iostream>

void dummy_handler() {
    static int counter = 0;
    std::cout << "Handler " << ++counter << "\n";
}

int main() {
    // Регистрируем 100 обработчиков
    for (int i = 0; i < 100; ++i) {
        if (std::atexit(dummy_handler) != 0) {
            std::cerr << "Failed at " << i << "\n";
            return 1;
        }
    }
    
    std::cout << "All registered!\n";
    return 0;
}

std::optional<std::string> get_name() {
    return "Alice";
}

int main() {
    auto result = get_name()
        .transform([](auto&& s) { s += " Smith"; return s; })
        .transform([](auto&& s) { s += " Jr."; return s; });

    std::cout << *result << std::endl;
    std::cout << *get_name() << std::endl;
}