如何强制执行“覆盖"关键字?

How to enforce the #39;override#39; keyword?(如何强制执行“覆盖关键字?)

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问题描述

有什么方法可以强制在 Visual C++ 2012 中使用 C++11 override 关键字?

Is there any way to enforce the usage of the C++11 override keyword in Visual C++ 2012?

(即如果我忘记说override,那么我想收到警告/错误.)

(i.e. if I forget to say override, then I want to get a warning/error.)

推荐答案

C++11 几乎有你想要的.

C++11 almost had what you want.

最初 override 关键字是更大提案的一部分 (N2928),其中还包括强制使用的能力:

Originally the override keyword was part of a larger proposal (N2928) which also included the ability to enforce its usage:

class A
{
  virtual void f();
};

class B [[base_check]] : public A
{
    void f();  // error!
};

class C [[base_check]] : public A
{
  void f [[override]] ();  // OK
};

base_check 属性会使在不使用 override 关键字的情况下覆盖虚函数时出错.

The base_check attribute would make it an error to override a virtual function without using the override keyword.

还有一个 hiding 属性,表示函数隐藏基类中的函数.如果使用了 base_check 并且一个函数在基类中隐藏了一个函数而不使用 hiding,那就是一个错误.

There was also a hiding attribute which says a function hides functions in the base class. If base_check is used and a function hides one from the base class without using hiding it's an error.

但是大部分提案都被放弃了,只有 finaloverride 特性被保留下来,作为具有特殊含义的标识符"而不是属性.

But most of the proposal was dropped and only the final and override features were kept, as "identifiers with special meaning" rather than attributes.

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