Mega Code Archive
Use dynamic_cast to replace typeid
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#include <iostream>
#include <typeinfo>
using namespace std;
class Base {
public:
virtual void f() {}
};
class Derived : public Base {
public:
void derivedOnly() {
cout << "Is a Derived Object.\n";
}
};
int main()
{
Base *bp, baseObject;
Derived *dp, d_ob;
//////////////////////////////////////////////////////// use typeid
bp = &baseObject;
if(typeid(*bp) == typeid(Derived)) {
dp = (Derived *) bp;
dp->derivedOnly();
}
else
cout << "Cast from Base to Derived failed.\n";
bp = &d_ob;
if(typeid(*bp) == typeid(Derived)) {
dp = (Derived *) bp;
dp->derivedOnly();
}
else
cout << "Error, cast should work!\n";
/////////////////////////////////////////////////////// use dynamic_cast
bp = &baseObject;
dp = dynamic_cast<Derived *> (bp);
if(dp)
dp->derivedOnly();
else
cout << "Cast from Base to Derived failed.\n";
bp = &d_ob;
dp = dynamic_cast<Derived *> (bp);
if(dp) {
dp->derivedOnly();
}else
cout << "Error, cast should work!\n";
return 0;
}
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