c++提供的4种类型转换

看代码注释即可

#include 

class A
{
public:
	virtual void func() {
		std::cout << "I'm A" << std::endl;
	}
};

class B :public A
{
public:
	virtual void func() {
		std::cout << "I'm B" << std::endl;
	}
};


void test1()
{

	double a = 10.03;
	int b = static_cast(a);
	std::cout << b << std::endl;
	//int* p = static_cast(a); //error 不能使用static_cast在有类型指针之间进行类型转换
	int* p = reinterpret_cast(&a);//类似于c的万能转换

	B c;
	A* d = static_cast(&c);//多态 基类指针指向派生类对象
	d->func();


}


void test2()
{
	B b;
	b.func();
	A* a = dynamic_cast(&b);
	a->func();
	B* c = dynamic_cast(a);
	c->func();


}

void test3()
{
	int data = 10;
	const int* cpi = &data;

	int* pi = const_cast(cpi);

	const int* cpii = const_cast(pi);
}



int main()
{

//	test1();//static_cast  reinterpert_cast 
//	test2();//dynamic_cast
//	test3();//const_cast

	return 0;
}