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Fix comparison #13

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changkun merged 1 commit into from
Apr 12, 2018
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Fix comparison #13

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4 changes: 2 additions & 2 deletions book/02-usability.md
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ foo(int) is called
foo(char*) is called
```

从输出中我们可以看出，`nullptr` 与 `NULL` 与 `0` 均不相同。所以，请养成直接使用 `nullptr`的习惯。
从输出中我们可以看出，`NULL` 不同于 `0` 与 `nullptr`。所以，请养成直接使用 `nullptr`的习惯。

此外，在上面的代码中，我们使用了 `decltype` 和 `std::is_same` 这两个属于现代 C++ 的语法，简单来说，`decltype` 用于类型推导，而 `std::is_same` 用于比较两个类型是否相等，我们会在后面 [decltype](#decltype) 一节中详细讨论。

Expand Down Expand Up @@ -974,4 +974,4 @@ std::cout << new_enum::value3 << std::endl

<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-nd/4.0/80x15.png" /></a>

本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../LICENSE)。
本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 MIT 协议开源，参见[许可](../LICENSE)。