Ruby中的多重继承？ [英] Multiple Inheritance in Ruby?

问题描述

我认为Ruby除了mixin之外只允许单继承。但是，当我的类 Square 继承了类 Thing ， Thing 默认继承对象。

I thought that Ruby only allowed single inheritance besides mixin. However, when I have class Square that inherits class Thing, Thing in turn inherits Object by default.

class Thing
end

class Square < Thing
end

这不代表多重继承吗？

推荐答案

我认为你正在以错误的方式理解多重继承的含义。可能你想到的是多重继承是这样的：

I think you are taking the meaning of multiple inheritance in a wrong way. Probably what you have in mind as multiple inheritance is like this:

class A inherits class B
class B inherits class C

如果是这样，那就错了。这不是多继承的原因，Ruby也没有问题。多重继承的真正含义是：

If so, then that is wrong. That is not what multiple inheritance is, and Ruby has no problem with that. What multiple inheritance really means is this:

class A inherits class B
class A inherits class C

你肯定不能用Ruby做到这一点。

And you surely cannot do this in Ruby.

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