修正警告: moving a local object in a return statement prevents copy elision
修正警告: moving a local object in a return statement prevents copy elision

https://www.viva64.com/en/w/v828/

编译器会对返回本地变量优化([Named] Return Value Optimization (RVO/NRVO)),
无论是 C++11 之前还是之后, 添加 move 后反而会影响该优化.

C++ Core Guidelines F.48: Do not return std::move(local)

xiongziliang/ZLMediaKit,xiongziliang/ZLMediaKit,xiongziliang/ZLMediaKit,xiongziliang/ZLMediaKit