私有，公共和受保护继承之间的区别 [英] Difference between private, public, and protected inheritance

问题描述

我查看了SO，无法找到 public ， private 之间的区别的良好解释; protected 在C ++中继承。我发现的所有问题都涉及具体案例。一般来说有什么区别？

I looked on SO and couldn't find a good explanation of the difference between public, private, and protected inheritance in C++. All of the questions I've found deal with specific cases. What is the difference in general?

推荐答案

为了回答这个问题，我想先用自己的话来描述成员的访问者。如果你已经知道这一点，请跳到下一个标题。

To answer that question, I'd like to describe member's accessors first in my own words. If you already know this, skip to the heading "next:".

我知道有三个访问器： public ， protected 和 private 。

There are three accessors that I'm aware of: public, protected and private.

让：

class Base {
    public:
        int publicMember;
    protected:
        int protectedMember;
    private:
        int privateMember;
};

• 所有知道 Base 也知道 Base 包含 publicMember 。


• 只有孩子（及其子女）知道 Base 包含 protectedMember 。


• 没有人基础知道 privateMember 。


• Everything that is aware of Base is also aware that Base contains publicMember.
• Only the children (and their children) are aware that Base contains protectedMember.
• No one but Base is aware of privateMember.

意识到，我的意思是承认存在，因此能够访问。

By "is aware of", I mean "acknowledge the existence of, and thus be able to access".

公共，私人和受保护的继承也是如此。让我们考虑从 Base 继承的类 Base 和类 Child c>。

The same happens with public, private and protected inheritance. Let's consider a class Base and a class Child that inherits from Base.



• 如果继承为 public code>基本和子也知道子继承自<$如果继承为 protected ，则只有 及其子项都知道它们继承自 Base 。


• 如果继承为 private ，除了之外没有人知道继承。


• If the inheritance is public, everything that is aware of Base and Child is also aware that Child inherits from Base.
• If the inheritance is protected, only Child, and its children, are aware that they inherit from Base.
• If the inheritance is private, no one other than Child is aware of the inheritance.

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