我能用移出的物体做什么?
swap
template <typename T>void swap(T& a, T& b){
T c = std::move(a); // line 1
a = std::move(b); // line 2: assignment to moved-from object!
b = std::move(c); // line 3: assignment to moved-from object!}T c = std::move(a);T c(std::move(a));
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