C++虛解構函式

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使用虛解構函式舉例：

//本例示範解構函式需要被定義成虛函數的情況，注意建構函式是不可以被定義成虛函數的#include<iostream>using namespace std;class Base{public:~Base();//virtual ~Base();};Base::~Base(){cout<<"Base destructor"<<endl;}class Derived : public Base{private:int *p;public:Derived();~Derived();//virtual ~Derived();};Derived::Derived(){p = new int(0);}Derived::~Derived(){cout<<"Derived destructor"<<endl;}void fun(Base *b){delete b;}int main(){Base *b = new Derived();fun(b);//由於會直接調用基類，所以在衍生類別中分配的空間不會被釋放掉，造成記憶體泄露//解決方案是：將基類和衍生類別的解構函式聲明為虛函數（即每行注釋的代碼）system("pause");return 0;}

　　

 

C++虛解構函式