我可以禁止在对象实例上调用静态方法吗? [英] Can I forbid calling static methods on object instance?

问题描述

我的课堂上有很多转换功能:

I have class with lots of conversion functions:

class Something {
  public:

    string toXml();
    string toJson();
    ...

    static Something fromXml(string);  // factory
    static Something fromJson(string); // factory
    ...
};

因为可以在实例上调用静态函数， 编写这样的代码很容易:

Because static functions can be called on instance, it is easy to write code like this:

Something sss;

... initializing sss ...

string xml1 = sss.toXml();
sss.fromXml(xml1); // does nothing
string xml2 = sss.toXml();
assert(xml1 == xml2); // always true

所以我想禁止从XXX上调用对象，或者 至少让他们做一些不同的事情.

So I want to forbid calling fromXXX on objects, or at least make them do something different.

有没有办法做到这一点?

Is there a way to do this?

推荐答案

他们真的需要成为班级成员吗?防止这种情况的明显方法是使它们具有自由功能.

Do they really need to be class members? The obvious way to prevent this is to make them free functions.

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