delegate int SomeFunction();

class Pair {
    public SomeFunction    fa;
    public SomeFunction    fb;

    public Pair(SomeFunction fa, SomeFunction fb) {
	this.fa = fa;
	this.fb = fb;
    }
}

Pair builder(int v) {
    return new Pair(
	() => { return ++v; },
	() => { return --v; }
    );
}

void main() {
    Pair p1 = builder(10);
    Pair p2 = builder(100);

    stdout.printf("%d %d %d\n", p1.fa(), p1.fa(), p1.fb());
    stdout.printf("%d %d %d\n", p2.fa(), p2.fa(), p2.fb());
}