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changkun merged 1 commit into from
Oct 17, 2018
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Update 02-usability.md #43

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2 changes: 1 addition & 1 deletion book/zh-cn/02-usability.md
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Expand Up @@ -16,7 +16,7 @@ order: 2

`nullptr` 出现的目的是为了替代 `NULL`。在某种意义上来说，传统 C++ 会把 `NULL`、`0` 视为同一种东西，这取决于编译器如何定义 NULL，有些编译器会将 NULL 定义为 `((void*)0)`，有些则会直接将其定义为 `0`。

C++ **不允许**直接将 `void *` 隐式转换到其他类型（换句话说，`void *` 并不属于 C++ 语言的一部分）。但如果编译器尝试把 `NULL` 定义为 `((void*)0)`，那么在下面这句代码中：
C++ **不允许**直接将 `void *` 隐式转换到其他类型。但如果编译器尝试把 `NULL` 定义为 `((void*)0)`，那么在下面这句代码中：
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@changkun changkun Oct 17, 2018

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请给出 void * 在 11/14/17 中存在的具体证据。


```cpp
char *ch = NULL;
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