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对低风险的操作，因为编译器会替你找到经典的错误。同时你可以自信地采取更加激进的优 化，而不会意外引入崩溃或漏洞。 但 Rust 并不局限于底层系统编程。它表达力强、写起来舒适，让人能够轻松地编写出命令行 应用、网络服务器等各种类型的代码——在本书中就有这两者的简单示例。使用 Rust 能让你 把在一个领域中学习的技能延伸到另一个领域：你可以通过编写网页应用来学习 Rust，接着 将同样的技能应用到你的 Raspberry Rust 支持。你总是可以在 Rust 官网的工具页面 找到很多相对流行的编辑器和 IDE 列表。 离线使用本书 在一些示例中，我们将会使用标准库之外的 Rust 包。要运行这些示例，你需要保持网络连接， 或者事先下载好这些依赖。要提前下载依赖，可以运行以下命令。（我们稍后会详细解释 cargo 是什么，以及这些命令分别的作用。） $ cargo new get-dependencies $ cd eat_at_restaurant() { hosting::add_to_waitlist(); } 示例 7-11: 使用 use 将模块引入作用域 在作用域中增加 use 和路径类似于在文件系统中创建软连接（符号连接，symbolic link）。通 过在 crate 根增加 use crate::front_of_house::hosting，现在 hosting 在作用域中就是有效 的名称了，如同 hosting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 886 46.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 894 46.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Unless the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 886 46.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 894 46.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Unless the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020 47.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1031 47.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020 47.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1031 47.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020 47.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1031 47.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1059 48.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1071 48.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1058 48.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1070 48.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1058 48.5 Views (SubArrays and other view types) . . . . . . . . . . . . . . . . . . . . . . . . 1070 48.6 Concatenation and permutation . makes a copy of the selected part of the original string. Alternatively, it is possible to create a view into a string using the type SubString. More simply, using the @views macro on a block of code converts mutated argument shares memory with another argument, a situation known as aliasing (e.g. when one is a view of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected