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book: fix the wrong about delctype (#101)

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TinyWang
2020-05-30 21:26:10 +08:00
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book/zh-cn/02-usability.md
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@@ -369,7 +369,7 @@ auto arr = new auto(10); // arr 被推导为 int *
### decltype
`decltype` 关键字是为了解决 auto 关键字只能对变量进行类型推导的缺陷而出现的。它的用法和 `sizeof` 很相似：
`decltype` 关键字是为了解决 auto 关键字只能对变量进行类型推导的缺陷而出现的。它的用法和 `typeof` 很相似：
```cpp
decltype(表达式)