为什么一个类可以有自己的静态成员，而不是非静态成员?
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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