int n = [] (int x, int y) { return x + y; }(5, 4);
    cout << n << endl;


    // Assign the lambda expression that adds two numbers to an
    // auto variable.
    auto f = [n] (int x, int y) { return x + y + n; };

    n = 0;

    // Invoke the function object and print its result.
    cout << f(21, 12) << endl;