C++的类型转换(强转)你了解吗

    char a = 'a';
	double b = static_cast<double>(a);
	cout << b << endl;//97
	return 0;

class Animal
{
};
class Dog :public Animal 
{
};
class Other
{
};
int main()
{
	Animal* animal = NULL;
	Dog* dog = NULL;
	//将animal转为Dog*(向下类型转换，不安全)
	Dog * dog2 = static_cast<Dog*>(animal);
	Other* other = static_cast<Other*>(animal);//这个时候就会出错了，因为两个指针不是父子关系。
	return 0;
}

Animal animal;
Dog dog;
Animal& animalCopy = animal;
Dog& dogCopy = static_cast<Dog&>(animalCopy);
Dog& dogCopy2 = dog;
Animal& animalCopy2 = static_cast<Animal&>(dogCopy2);

	//指针：
	const int* p = NULL;
	int* pp = const_cast<int*>(p);
	const int* ppp = const_cast<const int*>(pp);
	//引用：
	int num = 10;
	int& num2 = num;
	const int& num3 = const_cast<const int&>(num2);

	int a = 10;
	int* p = reinterpret_cast<int*>(a);