Lazy.cs

    class Lazy<T> {
        private Func<T> GetValue;
        private bool HaveValue = false;
        private T CachedValue;


        public T Value {
            get {
                if (!HaveValue) CachedValue = GetValue();
                return CachedValue;
            }
        }

        public Lazy(Func<T> getter) {
            GetValue = getter;
        }
    }