std :: shared_ptr中的最大引用计数是多少？如果你试图超过它会发生什么？

If we assume that std::shared_ptr stores a reference count (which I realize the standard does not require, but I am unaware of any implementations that don't), that reference count has a limited number of bits, and that means there is a maximum number of references that are supported. That leads to two questions: stores a refe