public struct Maybe<T> where T : class
    {
        T Value;

        public static Maybe<T> Just(T t)
        {
            return new Maybe<T>() { Value = t };
        }

        public static Maybe<T> Nothing { get { return new Maybe<T>(); } }

        public static implicit operator Maybe<T>(T value)
        {
            return new Maybe<T>() { Value = value };
        }

        public void Guard(Action<T> valuePresent, Action valueAbsent)
        {
            if (Value != null)
            {
                if (valuePresent != null)
                    valuePresent(Value);
            }
            else if (valueAbsent != null) valueAbsent();
        }

        public TResult Guard<TResult>(Func<T, TResult> valuePresent, Func<TResult> valueAbsent)
        {
            if (Value != null)
            {
                if (valuePresent != null)
                    return valuePresent(Value);
            }
            else if (valueAbsent != null) return valueAbsent();
            throw new ArgumentException("A Maybe guard case was missing and hit");
        }
    }