struct P 
{
	int id;
	virtual size_t GetSizeOf() const
	{
		return sizeof(*this);
	}
	virtual ~P() = default;
};

struct C1 : P 
{
	int x;
	size_t GetSizeOf() const override
	{
		return sizeof(*this);
	}
};

struct C2 : P 
{
	int y;
	int z;
	size_t GetSizeOf() const override
	{
		return sizeof(*this);
	}
};

C1 c1;
C2 c2;
P* p[2] = { &c1, &c2 };

void setup() 
{
	Serial.begin(9600);

	c1.id = 1;
	c2.id = 2;
	for (size_t i = 0; i < 2; i++) 
	{
		Serial.println(p[i]->GetSizeOf());
	}
}

void loop() 
{
}