c++ - 应用于基类列表的覆盖函数

Question

我只想知道有没有办法做这样的事情:

Class A {}; //Base class

Class B : A {}; //B inherits from A

Class C : A {}; //C inherits from A

...
...
...

void func(B){do x;}
void func(C){do y;}
...
...
...
list<A> l //l contains Bs or Cs.

for each element in l {func(element);}

并获得每个人的预期行为？

Answer 1

您可以执行以下操作:

    class A // Base clss
    {
       public: // or protected, depends on your needs
         virtual void func() {};
    };

    class B : public A //B inherits from A
    {
       public: // or protected, depends on your needs
         void func() { do x };
    }; 

    class C : public A //C inherits from A
    {
       public: // or protected, depends on your needs
         void func() { do y };
    }; 

    ...
    ...
    ...

    list<A*> l //l contains Bs or Cs.

    for each element in l { element->func(); }

通过这种方式，您可以使用多态性而不是重载静态函数 func。