[Xophmeister]

See also this much more detailed, four-part series on how to do the same in C++:

1. http://bartoszmilewski.com/2015/05/11/using-monads-in-c-to-s...

2. http://bartoszmilewski.com/2015/05/14/using-monads-in-c-to-s...

3. http://bartoszmilewski.com/2015/05/18/using-monads-in-c-to-s...

4. http://bartoszmilewski.com/2015/05/25/using-monads-in-c-to-s...