多次new一个对象会造成内存泄漏吗

Question

问题遇到的现象和发生背景

多次 new 一个对象然后只调用一次 delete 会造成内存泄漏吗？

问题相关代码，请勿粘贴截图

#include <iostream>

using namespace std;

class MyClass
{
public:
    MyClass() {
        cout << "constuct@ " << this << endl;
    }
    ~MyClass() {
        cout << "destruct@ " << this << endl;
    }
};


int main() {
    int count = 0;

    MyClass* cls;
    cout << "address_" << ++count << "@ " << &cls << endl;

    cls = new MyClass;
    cout << "address_" << ++count << "@ " << &cls << endl;

    cls = new MyClass;
    cout << "address_" << ++count << "@ " << &cls << endl;

    delete cls;

    return 0;
}

运行结果及报错内容

address_1@ 0000007A31DDFB58
constuct@ 00000233AB011210
address_2@ 0000007A31DDFB58
constuct@ 00000233AB011120
address_3@ 0000007A31DDFB58
destruct@ 00000233AB011120

Answer 1

当然会啦，你释放的只是最后一块内存！