If you are returning a parameter of your function, copy elision is inhibited.
如果你回到你的函数的参数，抑制复制的省略。
Copy elision is the only allowed form of optimization that can change the observable side-effects.
复制是唯一允许省略形式的优化，可以改变可观察到的副作用。
Copy elision is the only allowed form of optimization that can change the observable side-effects.
复制是唯一允许省略形式的优化，可以改变可观察到的副作用。
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