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Deep Copy in C++: How to Avoid Shallow Copy Pitfalls

Tutorial April 11, 2025 

class Deep {
public:
    int* data;

    Deep(int val) {
        data = new int(val);
    }

    // Copy constructor for deep copy
    Deep(const Deep& other) {
        data = new int(*other.data);
    }

    // Assignment operator for deep copy
    Deep& operator=(const Deep& other) {
        if (this != &other) {
            delete data;
            data = new int(*other.data);
        }
        return *this;
    }

    ~Deep() {
        delete data;
    }
};

If your class handles dynamic memory:

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