CPP_SmartPtr_08.cpp

void test02(){
    //unique pointer can access the same object at different time
    unique_ptr<Dog> pD (new Dog("Gunner"));
    unique_ptr<Dog> pD1 (new Dog("Smile"));
    pD1->bark();
    //Smile will be destroyed, and pD1 owns pD now
    pD1 = move(pD);
    pD1->bark();

    //release() function will return the raw pointer. It will also 
    //change the ownership of unique pointer and set it to nullptr.
    Dog* p = pD1.release(); 

    //reset pD to other object, if unique pointer originally owns an 
    //object, that object will be deleted!
    //pD.reset(new Dog(smokey)); 

    //same as pD = nullptr
    //pD.reset(); 

    if(!pD1) { // pD1 is empty now
        cout << "pD1 is empty now." <<endl;
    } 
}