c 中dynamic-ag真人游戏

#include 
#include 
using namespace std;
class cbase
{
public:
	cbase() { }
	virtual ~cbase() { }
	void mybase()
	{
		cout << "cbase::mybase" << endl;
	}
};
class cderive : public cbase
{
public:
	cderive() { }
	~cderive() { }
	void myderive()
	{
		cout << "cderive::myderive" << endl;
	}
};
int main(void)
{
	//上行的转换（派生类到基类的转换）
	shared_ptr spderiveup;
	shared_ptr spbaseup;
	spderiveup = make_shared();
	spbaseup = dynamic_pointer_cast(spderiveup);
	spbaseup->mybase();
	//下行的转换（基类到派生类的转换)
	shared_ptr spderivedown;
	shared_ptr spbasedown;
	spbasedown = make_shared();
	spderivedown = dynamic_pointer_cast(spbasedown);
	if (spderivedown == null)	//由于会进行类型的检查，这边是返回null
		cout << "spderivedown is null" << endl;
	/*
	shared_ptr spderivedown;
	shared_ptr spbasedown;
	spbasedown = make_shared();
	spderivedown = dynamic_pointer_cast(spbasedown);
	if (spderivedown == null)	//由于会进行类型的检查，这边是返回null
		cout << "spderivedown is null" << endl;
	spderivedown->myderive();
	*/
	return 0;
}

运行结果：

#include 
#include 
using namespace std;
class cbase
{
public:
	cbase() { }
	virtual ~cbase() { }
	void mybase()
	{
		cout << "cbase::mybase" << endl;
	}
};
class cderive : public cbase
{
public:
	cderive() { }
	~cderive() { }
	void myderive()
	{
		cout << "cderive::myderive" << endl;
	}
};
int main(void)
{
	//上行的转换（派生类到基类的转换）
	shared_ptr spderiveup;
	shared_ptr spbaseup;
	spderiveup = make_shared();
	spbaseup = dynamic_pointer_cast(spderiveup);
	spbaseup->mybase();
	//下行的转换（基类到派生类的转换)
	/*
	shared_ptr spderivedown;
	shared_ptr spbasedown;
	spbasedown = make_shared();
	spderivedown = dynamic_pointer_cast(spbasedown);
	if (spderivedown == null)	//由于会进行类型的检查，这边是返回null
		cout << "spderivedown is null" << endl;
	*/
	shared_ptr spderivedown;
	shared_ptr spbasedown;
	spbasedown = make_shared();
	spderivedown = dynamic_pointer_cast(spbasedown);
	if (spderivedown == null)	//由于会进行类型的检查，这边是返回null
		cout << "spderivedown is null" << endl;
	spderivedown->myderive();	
	return 0;
}

运行结果：