为什么在C ++中override是可选的？ [英] Why is override optional in C++?

问题描述

我了解 C ++覆写的目的，但我的实施有点困惑

I understand the purpose of the C++ override, however am a bit confused by it's implementation compared to other higher level languages, where its use is required by default.

C ++ 11 wiki页面将其描述为声明器属性的技术标识符，但不详细说明为什么它不是简单的语言关键字。

The C++11 wiki page describes it as a "technically identifier for declarator attribute" but does not elaborate as to why it is not simply a keyword for the language.

推荐答案

这是可选的维持与C ++ 03的向后兼容性。使其不可选会破坏所有的代码 ^* 。

It is optional to maintain backwards compatibility with C++03. Making it non-optional would have broken all the code^*.

同样，使 override 关键字会破坏使用名称 override 的任何代码。

Similarly, making override a keyword would have broken any code that used the name override.

^{OK，不是字面上的全部代码，但很多。}

^{OK, not literally all the code, but a lot of it.}

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