Thread: casting error

Hi,
i got a base class,and 2 derieved classes.derieved1 and derieved 2.

In the main class,i create a derieved1 and derieve2 object. add it to vector vector<base*> list .

Then i try casting out the first vector item to see if dereived 1 or derieved2. the tests to check if derieved 1 or 2 work for both.

The classes:

Code:

class base{
    protected:
        base(int val){
            value=val;
        }
    public:
	int value;
};

class derieved1:public base {
    private:
	string data;
         
        
    public:
	derieved1(int val,string x):base(val),data(x){ }
        void print(){
             cout<<"\ndereieved 1";
        }
};

class derieved2:public base {
    private:
        string data;
    public:
        derieved2(int val,string x):base(val),data(x){
        }
        void print(){
             cout<<"\ndereieved 2";
        }
};

the main function:

Code:

int main(int argc, char *argv[])
{
    vector<base*> list;
    derieved1* a=new derieved1(1,"derieved1");
    derieved2* b=new derieved2(2,"derieved2");
    
    list.push_back(a);
    list.push_back(b);
    
    base* bbbb=list[0];
    
    //cast it to both derieved objects.    
    derieved1*sb=static_cast<derieved1*>(bbbb);
    
    derieved2*sb1=static_cast<derieved2*>(bbbb);
    
    //check which one is valid.
    
    if(sb){
           cout<<"object of type derieved1"<<endl;
    }
    if(sb1){
           cout<<"object of type derieved2"<<endl; //should not display
    }
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

The program prints outs :

object of type derieved1
object of type derieved2