成员变量可以永远不会被捕获的值。被值捕获的是隐藏的这个指针用于访问它们。因此，它通过值捕获指针，这意味着它通过引用捕获此对象（及其成员）。

Member variables can never be captured by value. What's being captured by value is the implicit this pointer used to access them. Therefore, it's capturing a pointer by value, which means it captures this object (and its members) by reference.