c++-深拷贝

//DeepCopy.cpp 
#include <iostream>
using namespace std;

template<class object>
class ObjectCell {
    public:
        explicit ObjectCell(object initValue = object());
        ObjectCell(const ObjectCell &rhs);
        ~ObjectCell();
        
        const ObjectCell& operator=(const ObjectCell &rhs);
        
        object read();
        void write(object x);
    private:
        object* storeValue;
};

template<class object>
ObjectCell<object>::ObjectCell(object initValue) {
    storeValue = new object(initValue);
}

25 template<class object>
26 ObjectCell<object>::ObjectCell(const ObjectCell &rhs) {
27     storeValue = new object(*rhs.storeValue);
28 }

template<class object>
ObjectCell<object>::~ObjectCell() {
    delete storeValue;
}

35 template<class object>
36 const ObjectCell<object>& ObjectCell<object>::operator=(const ObjectCell &rhs) {
37     if(this != &rhs)
38         *storeValue = *rhs.storeValue;
39     return *this;
40 }

template<class object>
object ObjectCell<object>::read() {
    return *storeValue;
}

template<class object>
void ObjectCell<object>::write(object x) {
    *storeValue = x;
}

int main() {
    ObjectCell<int> icell1;
    ObjectCell<int> icell2(2);
    ObjectCell<int> icell3(icell2);

    cout << icell1.read() << endl;
    cout << icell2.read() << endl;
    cout << icell3.read() << endl;

    icell3.write(5);
    cout << icell3.read() << endl;

    ObjectCell<int> icell4;
    ObjectCell<int> icell5;
    icell5 = icell4 = icell3;
    cout << icell4.read() << endl;
    cout << icell5.read() << endl;
}