does the value of pointers change if exception occurs during assignment?

Consider the following code where pb is a member of class myclass:

myclass& operator=(const myclass& rhs){
    myclass *pOrig = pb;
    pb = new myclass(*rhs.pb);  //exception occurs here .
    delete pOrig;            
    return *this; 
}

Will the value of pb remain the same or will it change ? Explain.