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C++錯誤之一 :invalid initialization of non-const reference of type ‘xxx&’ from an rvalue of type ‘xxx’
時間 2020-08-10
標籤
c++
錯誤
之一
invalid
initialization
non
const
reference
type
rvalue
欄目
C&C++
简体版
原文
原文鏈接
一、看代碼 二、編譯結果 三、分析和解決 就拿f(a + b)來講,a+b的值會存在一個臨時變量中,當把這個臨時變量傳給f時,因爲f的聲明中,參數是int&,不是常量引用,由於c++編譯器的一個關於語義的限制。若是一個參數是以非const引用傳入,c++編譯器就有理由認爲程序員會在函數中修改這個值,而且這個被修改的引用在函數返回後要發揮做用。但若是你把一個臨時變量看成非const引用參數傳
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