#include<iostream>using namespace std;class Animal{public: virtual void action() { cout<<"the action is animal's "<<endl; }};class Dog:public Animal{public: virtual void action() { cout<<"the action is dog's "<<endl; } void doSwim() { cout<<"the dog is swimming..."<<endl; }};class Cat:public Animal{public: virtual void action() { cout<<"the action is cat's "<<endl; } void doTree() { cout<<"the cat is claming tree..."<<endl; }};class Desk{public: void action() { cout<<"this is Desk, not belong Animal"<<endl; }};void ObjPlay(Animal *animl){ animl->action(); Dog *dog = dynamic_cast<Dog *>(animl); if(dog!=NULL) //判斷是不是dog { dog->action(); dog->doSwim(); } Cat *cat = dynamic_cast<Cat *>(animl); if(cat!=NULL) //判斷是不是cat { cat->action(); cat->doTree(); } cout<<"func ObjPlay is exit!!!/n"<<endl;}//典型用法 把形參的只讀屬性去掉void Opbuf(const char *p){ cout << p << endl; //char *p2 = p; err:const char *不能初始化為char * //p[0] = 'b'; err:必須是可修改的左值 char *p2 = const_cast<char*>(p); //去除只讀的屬相 p2[0] = 'b'; cout << p << endl;}int main(){ //靜態類型轉化 static_cast<>() double d = 3.14159; int i1,i2; i1 = d; //C中的隱式類型轉化 i2 = static_cast<int>(d); //C++中的靜態類型轉化 cout<<"C中類型轉化："<<i1<<endl; cout<<"C++中類型轉化："<<i2<<endl; //重新解釋類型reinterpret_cast<>() char *p = "abcd"; int *p1 = NULL; int *p2 = NULL; p1 = (int *)p; //C中強制類型轉化 //p2 = static_cast<int *>(p);  編譯報錯，類型轉化錯誤，靜態類型不能轉化指針 p2 = reinterpret_cast<int *>(p); //C++中的重新解釋類型 cout<<"C中類型轉化"<<hex<<*p1<<endl; cout<<"C++中類型轉化："<<hex<<*p2<<endl; //動態類型轉換 dynamic_cast<>() Animal an; Animal *pAn = &an; ObjPlay(pAn); Dog dog; Dog *pDog = &dog; ObjPlay(pDog); Cat cat; Cat *pCat = &cat; ObjPlay(pCat); Desk desk; Desk *pDesk = &desk; //Animal *pAn = dynamic_cast<Animal*>(pDesk); 不同的基類指針之間不能相互轉化，安全 //去除變量的只讀屬性，const_cast<>(),此類型必須是指針 char buf[100] = "aaaaaaaaaaaa"; //Opbuf(buf); //要保證指針所執行的內存空間能修改才行 若不能修改 還是會引起程序異常 //Opbuf("dddddddddddsssssssssssssss"); system("pause"); return 0;}