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同样是 return 一个中间变量，为什么另一种代码的反汇编分配了两次空间？
source link: https://www.v2ex.com/t/582872
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程序员 - @amiwrong123 - 总所周知，函数体返回值那里没有&，就会返回一个中间变量。```cppclass sale {public: int i = 1;};sale add(const sale&
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