为什么显式调用析构函数会导致双重释放？

#include <iostream>

class MyClass {
public:
    MyClass() {
        std::cout << "Constructor called" << std::endl;
        data = new int(0);
    }
    ~MyClass() {
        std::cout << "Destructor called" << std::endl;
        delete data;
    }
private:
    int* data;
};

int main() {
    MyClass* obj = new MyClass();
    obj->~MyClass(); // 显式调用析构函数
    delete obj; // 再次销毁对象，导致双重释放
    return 0;
}

#include <iostream>
#include <memory>

class MyClass {
public:
    MyClass() {
        std::cout << "Constructor called" << std::endl;
        data = new int(0);
    }
    ~MyClass() {
        std::cout << "Destructor called" << std::endl;
        delete data;
    }
private:
    int* data;
};

int main() {
    std::unique_ptr<MyClass> obj = std::make_unique<MyClass>();
    // 不需要手动调用析构函数或delete操作
    return 0;
}