Coding With Joseph

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C++ Quiz #34

Shallow Copy Bug

mediumRule of Three

This code crashes when the objects are destroyed. What is the bug in the copy constructor?

📄 Code

1#include <iostream>
2using namespace std;
3 
4class Array {
5public:
6    int* data;
7    int size;
8    Array(int s) : size(s) {
9        data = new int[size];
10    }
11    Array(const Array& other) {
12        size = other.size;
13        data = other.data;  // copy the pointer
14    }
15    ~Array() { delete[] data; }
16};
17 
18int main() {
19    Array a(5);
20    a.data[0] = 99;
21    Array b = a;
22    cout << b.data[0] << endl;
23    return 0;
24}