� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � C � 27 C + + ) � � � � garbage collector ( � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ) � � � � � � � � � � ( � � � � � � � � � � � . • � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ) garbage collector ( � � � � � � � � � � � � � � � � - � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ' T ' � � � � � � � . • � � � � � reference cycle � � � � � � � � Arc � � garbage collector � � � � � � � � � � � � � � � � � � � � � � � � � � � � . – std::sync::Weak � � � � � � � � � �

language feeling. In addition you get fast and predictable performance like C and C++ (no garbage collector) as well as access to low-level hardware (should you need it). 4.3 Playground The Rust Playground to mis-use these tools and create similar bugs to C. • Java, Go, and Python rely on the garbage collector to identify memory that is no longer reachable and discard it. This guarantees that any pointer resources. Students familiar with garbage-collection implementations will know that a garbage collector starts with a set of ”roots” to find all reachable memory. Rust's ”single owner” principle is a

language feeling. In addition you get fast and predictable performance like C and C++ (no garbage collector) as well as access to low-level hardware (should you need it). 4.3 Playground The Rust Playground to mis-use these tools and create similar bugs to C. • Java, Go, and Python rely on the garbage collector to identify memory that is no longer reachable and discard it. This guarantees that any pointer resources. Students familiar with garbage-collection implementations will know that a garbage collector starts with a set of ”roots” to find all reachable memory. Rust's ”single owner” principle is a

易用 可靠 Why Rust ？ Performance • Blazingly fast and memory-efficient • No runtime or garbage collector Reliability • Guaranteed memory safety • “Fearless Concurrency” Productivity • Modern development

����� 1.3.1 ��� ��������������Rust ����� ����������Rust ��� C/C++ �������� ������ Garbage Collector (GC)�� �������������������� 1.3.2 ������� Rust ��������������������������� C/C++ ������������

language feeling. In addition you get fast and predictable performance like C and C++ (no garbage collector) as well as access to low-level hardware (should you need it). 4.3 プレイグラウンド このコースの例や演習には、短い Rust プログラミング スキルの向上とテストを目的としたタスクまたは問題。 • 関数（function）: 特定のタスクを実行する再利用可能なコードブロック。 • ガベージ コレクタ（garbage collector）: 使用されなくなったオブジェクトが占有していたメモリを自動的に解放するメカニズム。 • ジェネリクス（generics）: 型のプレースホルダを使用してコードを記述し、さまざまなデータ型でコードを再利用できる

unique feature, and it enables Rust to make memory safety guarantees without needing a garbage collector. There- fore, it’s important to understand how ownership works in Rust. In this chapter we’ll talk universal in programming languages. However, the second part is different. In languages with a garbage collector (GC), the GC keeps track and cleans up memory that isn’t being used anymore, and we, as the programmer

。 • 练习（exercise）： 专为练习和测试编程技能而设计的任务或问题。 • 函数（function）： 用于执行特定任务且可重复使用的代码块。 • 垃圾回收器（garbage collector）： 一种自动释放不再使用的对象所占内存的机制。 • 泛型（generics）： 这项功能支持使用类型占位符编写代码，支持对不同数据类型的代码进行重复使用。 • 不可变（immutable）：

Além disso você obtém desempenho rápido e previsível como C e C++ (sem coletor de lixo ou ”garbage collector”) bem como acesso a hardware de baixo nível (caso você precise) 4.3 Playground O Rust Playground

a5e0c5b2c5f9054be3b961aea2c7edfeea591de8 所有权（系统）是 Rust 最为与众不同的特性，对语言的其他部分有着深刻含义。它让 Rust 无 需垃圾回收（garbage collector）即可保障内存安全，因此理解 Rust 中所有权如何工作是十 分重要的。本章，我们将讲到所有权以及相关功能：借用（borrowing）、slice 以及 Rust 如 何在内存中布局数据。 71/600 String::from 时，它的实现 (implementation) 请求其所需的内 存。这在编程语言中是非常通用的。 然而，第二部分实现起来就各有区别了。在有 垃圾回收（garbage collector，GC）的语言中， GC 记录并清除不再使用的内存，而我们并不需要关心它。在大部分没有 GC 的语言中，识别 出不再使用的内存并调用代码显式释放就是我们的责任了，跟请求内存的时候一样。从历史的