C++11: final与override

• C++11中增加了final与override关键字，貌似是从Java语言中借鉴而来，用途也一样。看例子代码：

  01.#include <iostream>

  02. 

  03.using namespace std;

  04. 

  05./* use final on a class to prevent inheriting; compilation error */

  06.class A /* final */ {

  07.public:

  08./* use final on a method to prevent override; compilation error */

  09.virtual void func(int) /* final */ { cout << "A::func()" << endl; }

  10.};

  11. 

  12.class B : public A {

  13.public:

  14./* use override to make the compiler checks that we are indeed overriding an inherited method */

  15.virtual void func(int) override { cout << "B::func()" << endl; }

  16. 

  17./* virtual void func(char) override {} compilation error; new method (see signature), does not override existing */

  18.};

  19. 

  20.int main() {

  21.A t;

  22.t.func(2);

  23. 

  24.B u;

  25.u.func(3);

  26.}

  程序输出：
  A::func()
  B::func()