保护继承 [英] protected inheritance

问题描述

为什么要定义和提出保护和私有继承？我理解一些情况下，可以使用私人继承，但不推荐。如何保护继承？

Why protected and private inheritance are defined and proposed? I understand some cases private inheritance could be used but it is not recommended. How about protected inheritance?

任何人都可以提供一种保护继承是一种选择的情况？

Can anyone offer me an situation in which protected inheritance is a choice?

很少看到这个。

非常感谢！

推荐答案

私人继承通常用于mixins - 其中人们继承从基类获取功能，而不是因为is-a继承。

Private inheritance is usually used for mixins---where people inherit to get functionality from the base class, rather than because of "is-a" inheritance.

保护继承也可以用于mixins，其中混合功能也可用于下游类。

Protected inheritance can also be used for mixins, where the mixed-in functionality is to be available to downstream classes too.

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