参考: https://www.geeksforgeeks.org/why-is-the-size-of-an-empty-class-not-zero-in-c/https://stackoverflow.com/questions/4819936/why-no-default-move-assignment-move-constructor 移动语义 (Move Semantics) 接着我们写移动构造函数(move constructor)和移动赋值运算符(move assignment operator): /*移动...