vector 拷贝一段

vector类的定义如下：

class vector {
private:
    int* data;
    int size;
public:
    vector(int n) {
        data = new int[n];
        size = n;
    }
    ~vector() {
        delete[] data;
    }
    // 拷贝构造函数
    vector(const vector& other) {
        size = other.size;
        data = new int[size];
        for (int i = 0; i < size; i++) {
            data[i] = other.data[i];
        }
    }
};

已知一个对象`vector a(10)`，实现`vector b(a)`的拷贝，可以直接使用拷贝构造函数：

vector b(a);

完善程序如下：

#include <iostream>
using namespace std;

class vector {
private:
    int* data;
    int size;
public:
    vector(int n) {
        data = new int[n];
        size = n;
    }
    ~vector() {
        delete[] data;
    }
    // 拷贝构造函数
    vector(const vector& other) {
        size = other.size;
        data = new int[size];
        for (int i = 0; i < size; i++) {
            data[i] = other.data[i];
        }
    }
};

int main() {
    vector a(10);
    vector b(a);
    return 0;
}