#include <iostream>

struct widget
{
	virtual ~widget(void) = 0;

	virtual void method(void)
	{
		std::cout << __FUNCTION__ << std::endl;
	}
};

widget::~widget(void)
{
}

struct gadget : widget
{
};

int main(void)
{
	gadget g;
//	widget w; // ng

	widget *p = new gadget;
//	widget *q = new widget;  // ng

	return 0;
}