class UndoActions {
	bool commited = false;
	std::vector<std::function<void()>> actions;

public:
	UndoActions(const UndoActions&) = delete;
	UndoActions(UndoActions&&)      = delete;
	// то же для оператора=
	~UndoActions()
	{
		if (commited)
			return;
		
		for (auto it = actions.rbegin(); it != actions.rend(); ++it)
			(*it)();
	}
	void Commit()
	{
		commited = true;
	}
	template<typename F>
	void Add(F&& f)
	{
		actions.emplace_back(std::forward<F>(f));
	}
};