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考虑介绍 C++26 起的错误行为 #76

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frederick-vs-ja opened this issue Dec 31, 2024 · 0 comments

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frederick-vs-ja commented Dec 31, 2024

cppguidebook/docs/undef.md

Lines 585 to 599 in 8119e85

    
           ### 不能读取未初始化的变量 
        
           ```cpp 
        
           int i; 
        
           cout << i; // 错！ 
        
           int i = 0; 
        
           cout << i; // 可以，会读到 0 
        
           int arr[10]; 
        
           cout << arr[0]; // 错！ 
        
           int arr[10] = {}; 
        
           cout << arr[0]; // 可以，会读到 0 
        
           ```

这里的错误操作在 C++26 起不再导致未定义行为而是导致（良定义的）错误行为，见 P2795R5。

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