C++/Class/dynamic cast — различия между версиями
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Версия 14:21, 25 мая 2010
dynamic_cast between base class and derived class
#include <iostream>
#include <exception>
using namespace std;
class CBase { virtual void dummy() {cout << "base";} };
class CDerived: public CBase { int a; };
int main () {
try {
CBase * pba = new CDerived;
CBase * pbb = new CBase;
CDerived * pd;
pd = dynamic_cast<CDerived*>(pba);
if (pd==0) cout << "Null pointer on first type-cast" << endl;
pd = dynamic_cast<CDerived*>(pbb);
if (pd==0) cout << "Null pointer on second type-cast" << endl;
} catch (exception& e) {cout << "Exception: " << e.what();}
return 0;
}