如果您使用的是与 C++0x 兼容的编译器和标准库，您可以从第一个示例中获得更好的性能什么都不做强>.get_vector(_n, _m) 的返回值是一个临时值，std::vector 的移动构造函数(一个接受右值引用的构造函数)将被自动调用您无需再做进一步的工作.

If you're using a C++0x-compatible compiler and standard library, you get better performance from the first example without doing anything. The return value of get_vector(_n, _m) is a temporary, and the move constructor for std::vector (a constructor taking an rvalue reference) will automatically be called with no further work on your part.

一般来说，非库作者不需要直接使用右值引用；你会自动获得相当大的好处.

In general, non-library writers won't need to use rvalue references directly; you'll just reap a decent chunk of the benefits automatically.