class Child
{
  public:
    Child()
    {
      Serial1.println("Child()");
    };
    Child(size_t i)  
      : m_i {i}
    {
      print(true, "()");
    };
    void print(bool ln = false, char sep[2] = "[]")
    {
      Serial1.print("Child");
      Serial1.print(sep[0]);
      Serial1.print(m_i);
      Serial1.print('=');
      Serial1.print(m_value);
      Serial1.print(sep[1]);
      if (ln) Serial1.println();
    };
    void vset(size_t val)
    {
      m_value = val;
    };
  private:
    size_t  m_i;
    size_t  m_value = 0;
};

class Parent
{
  public:
    Parent()
    {
      Serial1.println("Parent()");
    };
    Parent(size_t i1, size_t i2, size_t p)
      : m_childs  { Child(i1)
                  , Child(i2)
                  }
      , m_p       {p}
    {
      print(true, "()");
    };
    void print(bool ln = false, char sep[2] = "[]")
    {
      Serial1.print("Parent");
      Serial1.print(sep[0]);
      Serial1.println(m_p);
      Serial1.print(", ");
      m_childs[0].print();
      Serial1.print(", ");
      m_childs[1].print();
      Serial1.println(sep[1]);
      if (ln) Serial1.println();
    };
    void vset(size_t m_value)
    {
      m_childs[0].vset(m_value);
    }
  private:
    Child   m_childs[2];
    size_t  m_p;
};

class RefParent
{
  public:
    RefParent()
    {
      Serial1.println("RefParent()");
    };
    RefParent(Parent* parent, size_t child, size_t index)
      : m_child   {Child(child)}
      , m_index   {index}
      , m_parent  {parent}
    {
      print(true, "()");
    };
    void print(bool ln = false, char sep[2] = "[]")
    {
      Serial1.print("RefParent");
      Serial1.print(sep[0]);
      Serial1.println(m_index);
      Serial1.print(" - ");
      m_child.print();
      Serial1.print(" - ");
      m_parent->print();
      Serial1.print(sep[1]);
      if (ln) Serial1.println();
    };
    void vset(size_t val)
    {
      m_parent->vset(val);
    };
  private:
    size_t  m_index;
    Child   m_child;
    Parent* m_parent;
};

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
  Serial1.println("Setup");
  Parent  parent(0,1,2);
  RefParent ref1(&parent, 3, 4);
  RefParent ref2(&parent, 5, 6);
  ref1.vset(9);
  parent.print(true);
  ref1.print(true);
  ref2.print(true);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1); // this speeds up the simulation
}