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为动态多态（晚绑定）例子加上虚析构和delete指针

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huihut 2018-05-02 11:35:32 +08:00
parent f11d2f3261
commit baf036d9b5
1 changed files with 5 additions and 0 deletions
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@ -515,6 +515,7 @@ public:
{ {
... ...
} }
virtual ~Shape();
}; };
class Circle : public Shape // 圆形类 class Circle : public Shape // 圆形类
{ {
@ -534,6 +535,10 @@ int main()
Shape * shape2 = new Rect(5.0, 6.0); Shape * shape2 = new Rect(5.0, 6.0);
shape1->calcArea(); // 调用圆形类里面的方法 shape1->calcArea(); // 调用圆形类里面的方法
shape2->calcArea(); // 调用矩形类里面的方法 shape2->calcArea(); // 调用矩形类里面的方法
delete shape1;
shape1 = nullptr;
delete shape2;
shape2 = nullptr;
return 0; return 0;
} }
``` ```