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inouaTI avatar inouaTI commented on July 17, 2024

上記ソース欄の下のソース欄

上記と同じく、const 変数を初期化する

8.5.6 リファレンス(References)

 #include 
 struct A { } ;
 struct B { } ;
 struct Base { } ;
 struct Derived : Base { } ;
 int main()
 {
 // エラー、BはAに対してリファレンス互換ではない
    A a ;
    B & b = a ; 
    int & r1 = 0 ; // エラー、prvalueでは初期化できない
    int x ;
    int & r2 = std::move( x ) ; // エラー、xvalueでは初期化できない
    Base base ;
    Derived & r3 = base ; // エラー、派生クラスは基本クラスに対してリファレンス互換ではない
【18818行】
-   int const ci ;
+   int const ci = 0 ;
    int & r4 = ci ; // エラー、CV修飾子が少ないので、リファレンス互換ではない
 } ;

from cpp-book.

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