在构造函数中通过引用传递值,保存它,然后稍后修改它,如何？

#include<iostream>

class MyClass {
public:
    MyClass(int& value) : _value(&value) {}

    void modifyValue(int newValue) {
        *_value = newValue;
    }

private:
    int* _value;
};

int main() {
    int value = 10;
    MyClass obj(value);

    std::cout << "Before modification: "<< value<< std::endl;
    obj.modifyValue(20);
    std::cout << "After modification: "<< value<< std::endl;

    return 0;
}

Before modification: 10
After modification: 20