#include <iostream>
#include <new>
 
using namespace std;
 
template <typename T>
class SmartWrapper
{
    private:
    T * obj;
    public:
    SmartWrapper(T * newObj)
    {
        cout << "Wrapper: Begin" << endl;
        obj = newObj;
    }
    ~SmartWrapper()
    {
        delete obj;
        cout << "Wrapper: End" << endl;
    }
};
 
class Person
{
    public:
    Person()
    {
        cout << "Person: Begin" << endl;
    }
    ~Person()
    {
        cout << "Person: End" << endl;
    }
};
 
class Dog
{
    public:
    Dog()
    {
        cout << "Dog: Begin" << endl;
    }
    ~Dog()
    {
        cout << "Dog: End" << endl;
    }
};
 
int main()
{
    // we should have the same number of begins and ends.
    // we actually have half of ends because objects created
    // without smart pointers are not deleted after each iteration.
    for(int i = 0; i < 2; i++)
    {
        Dog* c1 = new Dog();
        Person* c2 = new Person();
        SmartWrapper<Dog> s1(new Dog());
        SmartWrapper<Person> s2(new Person());
    }
 
   return 0;
}
 

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