.cs

struct Optional<T> {
  private bool present;
  private T value;

  public Optional(T value) {
    present = true;
    this.value = value;
  }

  public void Clear() {
    present = false;
    this.value = default(T);
  }

  public void Set(T value) {
    present = true;
    this.value = value;
  }

  public T Get() {
    if (present) {
      return value;
    } else {
      throw new Exception("fuck");
    }
  }
}