内存泄露之局部销毁

#include <iostream>
using namespace std;

#define DECLARE_SAFE_RELEASE()    virtual void Release()    { delete this; }
#define SAFE_RELEASE(p)            { if (NULL != p) { (p)->Release(); (p)=NULL; } }

class A
{
public:
    A() { pA = new int(10); cout << *pA << endl; }
    virtual ~A() { delete pA; cout << "pA is delete" << endl; }
    DECLARE_SAFE_RELEASE()

private:
    int * pA;
};

class B : public A
{
public:
    B() { pB = new int(20); cout << *pB << endl; }
    ~B() { delete pB; cout << "pB is delete" << endl; }

private:
    int * pB;
};

class C : public B
{
public:
    C() { pC = new int(30); cout << *pC << endl; }
    ~C() { delete pC; cout << "pC is delete" << endl; }

private:
    int * pC;
};

int main()
{
    A * p = new C;
    cout << "-----------------------------------" << endl;
    SAFE_RELEASE(p)

    cout << sizeof(A) << endl;
    cout << sizeof(B) << endl;
    cout << sizeof(C) << endl;

    return 0;
}

结果：

小结：

1.内存泄露之局部销毁解决方法。

2.父类的析构函数是虚函数，其子类，子类的子类的析构函数也是虚函数

3.代价：类的大小会增加，1个int型的体积