[c++] Collection of key and difficult points

Operator Overload

1. 在重载下标运算符时（数组符号）：不可重载为友元函数，必须是非static类的成员函数。 why

2. overload ++ 时，如果是:
int a; ++a; ++在前面时，怎么办？
答：counter counter::operator ++(int)

3. class F {
      public:
         double operator () (double x, double y) const;
   };
   为什么const放在了后面，感觉有点怪，难道不是:
         const double operator() (double x, double y); or
         double const operator() (double x, double y);

4. 关于虚析构函数，问：基类中的析构函数一般都设置为virtual，是么？不设置的话，会出现什么问题？

消息传递

对象之间通过消息传递方式进行通信。消息传递原是一种与通信有关的概念，OOP使得对象具有交互能力的主要模型就是消息传递模型。

类之间的消息传递最终在编译阶段转变为函数的参数。

时间： 2024-11-07 06:23:49

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