CPP_SmartPtr_04.cpp

void foo_01Func(){
    Dog* d = new Dog("Tank"); //Should not use
    shared_ptr<Dog> p(d); // p.get_count() == 1
    //Here when p goes out of scope, d will be destroyed. 
    //Then p2 goes out of scope, p2 will be destroyed again...
    shared_ptr<Dog> p2(d); // p2.get_count() == 1, the counter won't increase

    /* Lesson: An object should be assigned to a shrared_pointer 
    immediately when it is created. The above case does not follow 
    this rule. We first create the raw pointer d and then initialize 
    p and p2 with d. We should do somthing like: 
    shared_ptr<Dog> p(new Dog("Tank")), then shared_ptr<Dog> p2 = p.*/

}