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                [TOC] ## auto 用法 ``` auto i = 5; // i 被推導為 int auto arr = new auto(10) // arr 被推導為 int * ``` 注意:auto 不能用于函數傳參 ``` int add(auto x, auto y); ``` old ``` for(vector<int>::const_iterator itr = vec.cbegin(); itr != vec.cend(); ++itr) ``` new ``` // 由于 cbegin() 將返回 vector<int>::const_iterator // 所以 itr 也應該是 vector<int>::const_iterator 類型 for(auto itr = vec.cbegin(); itr != vec.cend(); ++itr); ``` ## decltype `decltype`關鍵字是為了解決 auto 關鍵字只能對變量進行類型推導的缺陷而出現的 對表達式進行類型推導 ``` auto x = 1; auto y = 2; decltype(x+y) z; // z 是一個 int 型的 ```
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