Then how will you implement it?

Think of this:

```

SYSCLASS struct Accessor; // unmovable and uncopyable

extern SYSAPI Accessor (*access)();

int main() {

    StoreAndGet<Accessor>(access());

}

```

We don't know what the function will do, and it's impossible to change the function. We only know that access() will construct a Accessor object and follow the calling convention, then we must call copy or move constructor, but in this case we can't do it.

For your example, if a function returns a unmovable and uncopyable object means that you shouldn't construct it by existing objects in your code.