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修改命名空间的using声明

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Maple Leaf 2024-03-19 14:41:30 +08:00
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@ -566,7 +566,7 @@ Derived(parms) : Base(args) { }
`using 指示` 使得某个特定命名空间中所有名字都可见，这样我们就无需再为它们添加任何前缀限定符了。如：
```cpp
using namespace_name name;
using namespace namespace_name;
```
#### 尽量少使用 `using 指示` 污染命名空间