菱形继承

/**
菱形继承 与 虚拟继承
*/
class SWYA
{
public:
	SWYA() :a(0) { cout << "construct A\n"; }
	~SWYA() { cout << "deconstruct A\n"; }
public:
	virtual void fun() { cout << "fun\n"; }
public:
	int a;
};

class SWYB :public /*virtual*/ SWYA
{
public:
	SWYB() { cout << "construct B\n"; }
	~SWYB() { cout << "deconstruct B\n"; }
};
class SWYC :public /*virtual*/ SWYA
{
public:
	SWYC() { cout << "construct C\n"; }
	~SWYC() { cout << "deconstruct C\n"; }
};
class SWYD :public SWYB, public SWYC
{
public:
	SWYD() { cout << "construct D\n"; }
	~SWYD() { cout << "deconstruct D\n"; }
};
/**
菱形继承 与 虚拟继承
*/

int main()
{
	SWYD* d = new SWYD();
	d->SWYA::a = 1;
	d->SWYB::a = 2;
	d->SWYC::a = 3;
	//d->a = 4;
	//d->fun();
	//d->a = 5;
	//d->a = 6;
	1 == 0;
	delete d;
}