static_cast的一个用法

static_cast可以用来将父类指针转换为子类指针。

#include<iostream>#include<string>using namespace std;class Animal{private:string type;public:Animal(){cout<<"new animal."<<endl;}};class Dog :public Animal{private:string name;public:Dog(){cout<<"new dog"<<endl;}};int main(){Animal ani;Dog dg;Animal* animal=&ani;Dog* dog=&dg;animal=&dg;dog=static_cast<Dog*>(&ani);return 0;}