#include <iostream>
class MessageBase {
public:
	virtual void speak() = 0;
	~MessageBase() = default;
};

class MoveMsg:MessageBase
{
public:
	virtual void speak() override
	{
		std::cout << "Move" << '\n';
	}
};

class SleepMsg :MessageBase
{
public:
	virtual void speak() override
	{
		std::cout << "Sleep" << '\n';
	}
};

class ExitMsg :MessageBase
{
public:
	virtual void speak() override
	{
		std::cout << "Exit" << '\n';
	}
};

#include <iostream>
#include <type_traits>
#include <string>

class MoveMsg
{
public:
	MoveMsg(int, int) {}
	void speak() 
	{
		std::cout << "Move" << '\n';
	}

	
};

class SleepMsg
{
public:
	SleepMsg(std::string) {}
	void speak()
	{
		std::cout << "Sleep" << '\n';
	}


};

class ExitMsg
{
public:
	void speak()
	{
		std::cout << "Exit" << '\n';
	}


};

template <typename Msg>
class MsgImpl {
	Msg msg;
public:
	template<typename... Args>
	MsgImpl(Args&&...args) : msg(std::forward<Args>(args)...) {}
	void speak()
	{
		msg.speak();
	}
};

int main()
{
	MsgImpl<MoveMsg> mmsg(1, 2);
	MsgImpl<SleepMsg> smsg("Hello");
    MsgImpl<ExitMsg> emsg();
	return 0;
}