range reference test

    struct Numbers {
        std::string word;
        int digit;
    };

    std::vector<Numbers> numbers = {
        {"one", 1},
        {"two", 2},
        {"three", 3},
        {"four", 4},
        {"five", 5}
    };

    const auto get_word = [](const Numbers & in) -> const std::string & {
        return in.word;
    };

    std::cout << "All:\n";
    for (auto & num : numbers) {
        std::cout << num.word << '\t' << &num.word << '\n';
    }

    std::cout << "\nTransformed:\n";
    for (auto & word : numbers | std::views::transform(get_word)) {
        std::cout << word << '\t' << &word << '\n';
    }