（C++）C++類繼承中的建構函式和解構函式

標籤：

思想：

在C++的類繼承中，

建立對象時，首先調用基類的建構函式，然後在調用下一個衍生類別的建構函式，依次類推；

析構對象時，其順序正好與構造相反；

例子：

#include <iostream>using namespace std;class Shape{public:    void Draw() {cout<<"Base::Draw()"<<endl;}    void Erase() {cout<<"Base::Erase()"<<endl;}    Shape() {Draw();}    ~Shape() {Erase();}};//-------------------------------------------------class Polygon:public Shape{public:    Polygon() {Draw();}    void Draw() {cout<<"Polygon::Draw()"<<endl;}    void Erase() {cout<<"Polygon Erase()"<<endl;}    ~Polygon() {Erase();}};//--------------------------------------------------class Rectangle:public Polygon{public:    Rectangle() {Draw();}    void Draw() {cout<<"Rectangle::Draw()"<<endl;}    void Erase() {cout<<"Rectangle Erase()"<<endl;}    ~Rectangle() {Erase();}};//--------------------------------------------------class Square:public Rectangle{public:    Square() {Draw();}    void Draw() {cout<<"Square::Draw()"<<endl;}    void Erase() {cout<<"Square Erase()"<<endl;}    ~Square() {Erase();}};//--------------------------------------------------int main(){    Polygon c;    Rectangle s;    Square t;    cout<<"------------------------------------------"<<endl;    return 0;}

結果：

（C++）C++類繼承中的建構函式和解構函式