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Update ch19-01-unsafe-rust.md

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Zheng Ping 2017-07-04 13:20:41 +08:00 committed by GitHub
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src/ch19-01-unsafe-rust.md
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@ -193,10 +193,7 @@ let slice = unsafe {
#### 调用外部代码的`extern`函数是不安全的
有时, 你的Rust代码需要与其它语言交互. Rust有一个`extern`关键字可以实现这个功能, 这有助于创建并使用*外部功能接口(Foreign Function Interface)* (FFI). 例19-8 demonstrates how
to set up an integration with a function named `some_function` defined in an
external library written in a language other than Rust. Functions declared
within `extern` blocks are always unsafe to call from Rust code:
有时, 你的Rust代码需要与其它语言交互. Rust有一个`extern`关键字可以实现这个功能, 这有助于创建并使用*外部功能接口(Foreign Function Interface)* (FFI). 例19-8演示了如何与定义在一个非Rust语言编写的外部库中的`some_function`进行交互. 在Rust中调用`extern`声明的代码块永远都是不安全的:
<span class="filename">Filename: src/main.rs</span>
@ -210,7 +207,7 @@ fn main() {
}
```
<span class="caption">Listing 19-8: Declaring and calling an `extern` function
<span class="caption">例19-8: Declaring and calling an `extern` function
defined in another language</span>
Within the `extern "C"` block, we list the names and signatures of functions