<img width="910" alt="截屏2022-05-09 下午6 37 50" src="https://user-images.githubusercontent.com/38584390/167393634-16991abb-8ea9-4b47-993b-9951a95fedc5.png"> <img width="803" alt="截屏2022-05-09 下午6 38 36" src="https://user-images.githubusercontent.com/38584390/167393736-9c094fdc-0258-4f0a-aa26-9a12e7c249d2.png"> - https://en.cppreference.com/w/cpp/language/value_category - https://zhuanlan.zhihu.com/p/22821671
