在C ++中绑定对尚未构造的对象的引用是否安全？

Consider this code sample:

考虑以下代码示例:

class Base {
public:
    Base( string& _object ) : object( _object ) {}
private:
    string& object;
};

class Derived: public Base {
public:
    Derived() : Base( object ) {}
private:
   string object;
};
class