为什么一个类可以有自己的静态成员，而不是非

Why is a class allowed to have a static member of itself, but not a non-static member?(为什么一个类可以有自己的静态成员，而不是非静态成员?)

问题描述

class base {
public:
    base a;
};

它会导致编译错误.

class base {
public:
    static base a;
};

而此代码不会给出编译错误

whereas this code does not give compilation error

推荐答案

因为 static 类成员没有存储在类实例中，这就是 static 可以工作的原因.

Because static class members are not stored in the class instance, that's why a static would work.

将一个对象存储在另一个相同类型的对象中会破坏运行时 - 无限大，对吧?

Storing an object inside another object of the same type would break the runtime - infinite size, right?

sizeof 会返回什么?编译器需要知道对象的大小，但是因为它包含了同类​​型的对象，所以没有意义.

What would sizeof return? The size of the object needs to be known by the compiler, but since it contains an object of the same type, it doesn't make sense.

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