accessor和mutator方法有什么区别？ [英] What is the difference between accessor and mutator methods?

问题描述

访问器和mutator如何不同？

How are accessors and mutators different? An example and explanation would be great.

推荐答案

访问器是一种类方法，用于读取数据成员，而 mutator 是用于更改数据成员的类方法。

An accessor is a class method used to read data members, while a mutator is a class method used to change data members.

下面是一个例子：

class MyBar;

class Foo
{
    public:
        MyBar GetMyBar() const { return mMyBar; } // accessor
        void SetMyBar(MyBar aMyBar) { mMyBar = aMyBar; } // mutator

    private:
        MyBar mMyBar;
}

最好的做法是使数据成员 code>（如上例所示），并且只能通过访问器和mutator访问它们。这是因为以下原因：

It's best practice to make data members private (as in the example above) and only access them via accessors and mutators. This is for the following reasons:

• 您知道他们何时被访问（并且可以通过断点调试）。


• mutator可以验证输入以确保其适合某些限制。


• 如果需要更改内部实现，您可以这样做，

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